Add egui-kittest

Cargo.lock

@@ -28,6 +28,22 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "accesskit"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e25ae84c0260bdf5df07796d7cc4882460de26a2b406ec0e6c42461a723b271b"
+
+[[package]]
+name = "accesskit_consumer"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8bfae7c152994a31dc7d99b8eeac7784a919f71d1b306f4b83217e110fd3824c"
+dependencies = [
+ "accesskit 0.19.0",
+ "hashbrown",
+]
+
 [[package]]
 name = "adler2"
 version = "2.0.0"
@@ -143,6 +159,12 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.98"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
+
 [[package]]
 name = "arboard"
 version = "3.5.0"
@@ -163,6 +185,12 @@ dependencies = [
  "x11rb",
 ]
 
+[[package]]
+name = "arrayref"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76a2e8124351fda1ef8aaaa3bbd7ebbcb486bbcd4225aca0aa0d84bb2db8fecb"
+
 [[package]]
 name = "arrayvec"
 version = "0.7.6"
@@ -406,7 +434,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
 dependencies = [
  "termcolor",
- "unicode-width",
+ "unicode-width 0.1.14",
 ]
 
 [[package]]
@@ -415,6 +443,16 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5b63caa9aa9397e2d9480a9b13673856c78d8ac123288526c37d7839f2a86990"
 
+[[package]]
+name = "colored"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "117725a109d387c937a1533ce01b450cbde6b88abceea8473c4d7a85853cda3c"
+dependencies = [
+ "lazy_static",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "combine"
 version = "4.6.7"
@@ -505,6 +543,25 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9dd111b7b7f7d55b72c0a6ae361660ee5853c9af73f70c3c2ef6858b950e2e51"
+dependencies = [
+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
+dependencies = [
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "crossbeam-utils"
 version = "0.8.21"
@@ -523,6 +580,25 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96a6ac251f4a2aca6b3f91340350eab87ae57c3f127ffeb585e92bd336717991"
 
+[[package]]
+name = "data-url"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c297a1c74b71ae29df00c3e22dd9534821d60eb9af5a0192823fa2acea70c2a"
+
+[[package]]
+name = "dify"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11217d469eafa3b809ad84651eb9797ccbb440b4a916d5d85cb1b994e89787f6"
+dependencies = [
+ "anyhow",
+ "colored",
+ "getopts",
+ "image",
+ "rayon",
+]
+
 [[package]]
 name = "dispatch"
 version = "0.2.0"
@@ -626,6 +702,7 @@ dependencies = [
  "objc2-foundation 0.2.2",
  "parking_lot",
  "percent-encoding",
+ "pollster",
  "profiling",
  "raw-window-handle",
  "ron",
@@ -635,6 +712,7 @@ dependencies = [
  "wasm-bindgen-futures",
  "web-sys",
  "web-time",
+ "wgpu",
  "winapi",
  "windows-sys 0.59.0",
  "winit",
@@ -645,7 +723,7 @@ name = "egui"
 version = "0.31.1"
 source = "git+https://github.com/emilk/egui?rev=f2ce6424f3a32f47308fb9871d540c01377b2cd9#f2ce6424f3a32f47308fb9871d540c01377b2cd9"
 dependencies = [
- "accesskit",
+ "accesskit 0.18.0",
  "ahash",
  "bitflags 2.9.0",
  "emath",
@@ -696,6 +774,21 @@ dependencies = [
  "winit",
 ]
 
+[[package]]
+name = "egui_extras"
+version = "0.31.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "624659a2e972a46f4d5f646557906c55f1cd5a0836eddbe610fdf1afba1b4226"
+dependencies = [
+ "ahash",
+ "egui",
+ "enum-map",
+ "log",
+ "mime_guess2",
+ "profiling",
+ "resvg",
+]
+
 [[package]]
 name = "egui_glow"
 version = "0.31.1"
@@ -730,6 +823,27 @@ dependencies = [
  "winit",
 ]
 
+[[package]]
+name = "egui_kittest"
+version = "0.31.1"
+source = "git+https://github.com/emilk/egui?rev=f2ce6424f3a32f47308fb9871d540c01377b2cd9#f2ce6424f3a32f47308fb9871d540c01377b2cd9"
+dependencies = [
+ "dify",
+ "eframe",
+ "egui",
+ "egui-wgpu",
+ "image",
+ "kittest",
+ "pollster",
+ "wgpu",
+]
+
+[[package]]
+name = "either"
+version = "1.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
+
 [[package]]
 name = "emath"
 version = "0.31.1"
@@ -745,6 +859,27 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34aa73646ffb006b8f5147f3dc182bd4bcb190227ce861fc4a4844bf8e3cb2c0"
 
+[[package]]
+name = "enum-map"
+version = "2.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6866f3bfdf8207509a033af1a75a7b08abda06bbaaeae6669323fd5a097df2e9"
+dependencies = [
+ "enum-map-derive",
+ "serde",
+]
+
+[[package]]
+name = "enum-map-derive"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f282cfdfe92516eb26c2af8589c274c7c17681f5ecc03c18255fe741c6aa64eb"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "enumn"
 version = "0.1.14"
@@ -853,6 +988,12 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "float-cmp"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98de4bbd547a563b716d8dfa9aad1cb19bfab00f4fa09a6a4ed21dbcf44ce9c4"
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
@@ -935,6 +1076,15 @@ dependencies = [
  "windows-targets 0.48.5",
 ]
 
+[[package]]
+name = "getopts"
+version = "0.2.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cba6ae63eb948698e300f645f87c70f76630d505f23b8907cf1e193ee85048c1"
+dependencies = [
+ "unicode-width 0.2.1",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.16"
@@ -1090,6 +1240,18 @@ dependencies = [
  "bitflags 2.9.0",
 ]
 
+[[package]]
+name = "gpu-allocator"
+version = "0.27.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c151a2a5ef800297b4e79efa4f4bec035c5f51d5ae587287c9b952bdf734cacd"
+dependencies = [
+ "log",
+ "presser",
+ "thiserror 1.0.69",
+ "windows",
+]
+
 [[package]]
 name = "gpu-descriptor"
 version = "0.3.1"
@@ -1326,6 +1488,12 @@ dependencies = [
  "tiff",
 ]
 
+[[package]]
+name = "imagesize"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "029d73f573d8e8d63e6d5020011d3255b28c3ba85d6cf870a07184ed23de9284"
+
 [[package]]
 name = "indenter"
 version = "0.3.3"
@@ -1349,14 +1517,16 @@ dependencies = [
  "base64 0.22.1",
  "eframe",
  "egui",
+ "egui_extras",
  "egui_glow 0.31.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "egui_kittest",
  "env_logger",
  "eyre",
  "getrandom 0.3.2",
  "half",
  "insta",
  "log",
- "rand",
+ "rand 0.9.1",
  "rfd",
  "serde",
  "wasm-bindgen-futures",
@@ -1471,6 +1641,31 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2db585e1d738fc771bf08a151420d3ed193d9d895a36df7f6f8a9456b911ddc"
 
+[[package]]
+name = "kittest"
+version = "0.1.0"
+source = "git+https://github.com/rerun-io/kittest?branch=main#91bf0fd98b5afe04427bb3aea4c68c6e0034b4bd"
+dependencies = [
+ "accesskit 0.19.0",
+ "accesskit_consumer",
+ "parking_lot",
+]
+
+[[package]]
+name = "kurbo"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd85a5776cd9500c2e2059c8c76c3b01528566b7fcbaf8098b55a33fc298849b"
+dependencies = [
+ "arrayvec",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.172"
@@ -1580,6 +1775,24 @@ dependencies = [
  "paste",
 ]
 
+[[package]]
+name = "mime"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
+
+[[package]]
+name = "mime_guess2"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1706dc14a2e140dec0a7a07109d9a3d5890b81e85bd6c60b906b249a77adf0ca"
+dependencies = [
+ "mime",
+ "phf",
+ "phf_shared",
+ "unicase",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.8.8"
@@ -2047,6 +2260,56 @@ version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
 
+[[package]]
+name = "phf"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd6780a80ae0c52cc120a26a1a42c1ae51b247a253e4e06113d23d2c2edd078"
+dependencies = [
+ "phf_macros",
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_generator"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c80231409c20246a13fddb31776fb942c38553c51e871f8cbd687a4cfb5843d"
+dependencies = [
+ "phf_shared",
+ "rand 0.8.5",
+]
+
+[[package]]
+name = "phf_macros"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f84ac04429c13a7ff43785d75ad27569f2951ce0ffd30a3321230db2fc727216"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unicase",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67eabc2ef2a60eb7faa00097bd1ffdb5bd28e62bf39990626a582201b7a754e5"
+dependencies = [
+ "siphasher 1.0.1",
+ "unicase",
+]
+
+[[package]]
+name = "pico-args"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5be167a7af36ee22fe3115051bc51f6e6c7054c9348e28deb4f49bd6f705a315"
+
 [[package]]
 name = "pin-project"
 version = "1.1.10"
@@ -2107,6 +2370,12 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "pollster"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f3a9f18d041e6d0e102a0a46750538147e5e8992d3b4873aaafee2520b00ce3"
+
 [[package]]
 name = "portable-atomic"
 version = "1.11.0"
@@ -2131,6 +2400,12 @@ dependencies = [
  "zerocopy 0.8.25",
 ]
 
+[[package]]
+name = "presser"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8cf8e6a8aa66ce33f63993ffc4ea4271eb5b0530a9002db8455ea6050c77bfa"
+
 [[package]]
 name = "proc-macro-crate"
 version = "3.3.0"
@@ -2179,6 +2454,15 @@ version = "5.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "74765f6d916ee2faa39bc8e68e4f3ed8949b48cccdac59983d287a7cb71ce9c5"
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand"
 version = "0.9.1"
@@ -2186,7 +2470,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9fbfd9d094a40bf3ae768db9361049ace4c0e04a4fd6b359518bd7b73a73dd97"
 dependencies = [
  "rand_chacha",
- "rand_core",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -2196,9 +2480,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.9.3",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+
 [[package]]
 name = "rand_core"
 version = "0.9.3"
@@ -2208,12 +2498,44 @@ dependencies = [
  "getrandom 0.3.2",
 ]
 
+[[package]]
+name = "range-alloc"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3d6831663a5098ea164f89cff59c6284e95f4e3c76ce9848d4529f5ccca9bde"
+
 [[package]]
 name = "raw-window-handle"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "20675572f6f24e9e76ef639bc5552774ed45f1c30e2951e1e99c59888861c539"
 
+[[package]]
+name = "rayon"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b418a60154510ca1a002a752ca9714984e21e4241e804d32555251faf8b78ffa"
+dependencies = [
+ "either",
+ "rayon-core",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1465873a3dfdaa8ae7cb14b4383657caab0b3e8a0aa9ae8e04b044854c8dfce2"
+dependencies = [
+ "crossbeam-deque",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "rctree"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b42e27ef78c35d3998403c1d26f3efd9e135d3e5121b0a4845cc5cc27547f4f"
+
 [[package]]
 name = "redox_syscall"
 version = "0.4.1"
@@ -2267,6 +2589,20 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832"
 
+[[package]]
+name = "resvg"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cadccb3d99a9efb8e5e00c16fbb732cbe400db2ec7fc004697ee7d97d86cf1f4"
+dependencies = [
+ "log",
+ "pico-args",
+ "rgb",
+ "svgtypes",
+ "tiny-skia",
+ "usvg",
+]
+
 [[package]]
 name = "rfd"
 version = "0.15.3"
@@ -2291,6 +2627,15 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "rgb"
+version = "0.8.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57397d16646700483b67d2dd6511d79318f9d057fdbd21a4066aeac8b41d310a"
+dependencies = [
+ "bytemuck",
+]
+
 [[package]]
 name = "ron"
 version = "0.8.1"
@@ -2303,6 +2648,12 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "roxmltree"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3cd14fd5e3b777a7422cca79358c57a8f6e3a703d9ac187448d0daf220c2407f"
+
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
@@ -2396,6 +2747,27 @@ version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbbb5d9659141646ae647b42fe094daf6c6192d1620870b449d9557f748b2daa"
 
+[[package]]
+name = "simplecss"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a9c6883ca9c3c7c90e888de77b7a5c849c779d25d74a1269b0218b14e8b136c"
+dependencies = [
+ "log",
+]
+
+[[package]]
+name = "siphasher"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38b58827f4464d87d377d175e90bf58eb00fd8716ff0a62f80356b5e61555d0d"
+
+[[package]]
+name = "siphasher"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56199f7ddabf13fe5074ce809e7d3f42b42ae711800501b5b16ea82ad029c39d"
+
 [[package]]
 name = "slab"
 version = "0.4.9"
@@ -2486,6 +2858,15 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
+[[package]]
+name = "strict-num"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6637bab7722d379c8b41ba849228d680cc12d0a45ba1fa2b48f2a30577a06731"
+dependencies = [
+ "float-cmp",
+]
+
 [[package]]
 name = "strum"
 version = "0.26.3"
@@ -2508,6 +2889,16 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "svgtypes"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e44e288cd960318917cbd540340968b90becc8bc81f171345d706e7a89d9d70"
+dependencies = [
+ "kurbo",
+ "siphasher 0.3.11",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.100"
@@ -2609,6 +3000,32 @@ dependencies = [
  "weezl",
 ]
 
+[[package]]
+name = "tiny-skia"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83d13394d44dae3207b52a326c0c85a8bf87f1541f23b0d143811088497b09ab"
+dependencies = [
+ "arrayref",
+ "arrayvec",
+ "bytemuck",
+ "cfg-if",
+ "log",
+ "png",
+ "tiny-skia-path",
+]
+
+[[package]]
+name = "tiny-skia-path"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c9e7fc0c2e86a30b117d0462aa261b72b7a99b7ebd7deb3a14ceda95c5bdc93"
+dependencies = [
+ "arrayref",
+ "bytemuck",
+ "strict-num",
+]
+
 [[package]]
 name = "tinystr"
 version = "0.7.6"
@@ -2684,6 +3101,12 @@ dependencies = [
  "rustc-hash",
 ]
 
+[[package]]
+name = "unicase"
+version = "2.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75b844d17643ee918803943289730bec8aac480150456169e647ed0b576ba539"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.18"
@@ -2702,6 +3125,12 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
 
+[[package]]
+name = "unicode-width"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a1a07cc7db3810833284e8d372ccdc6da29741639ecc70c9ec107df0fa6154c"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.6"
@@ -2719,6 +3148,50 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "usvg"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38b0a51b72ab80ca511d126b77feeeb4fb1e972764653e61feac30adc161a756"
+dependencies = [
+ "base64 0.21.7",
+ "log",
+ "pico-args",
+ "usvg-parser",
+ "usvg-tree",
+ "xmlwriter",
+]
+
+[[package]]
+name = "usvg-parser"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bd4e3c291f45d152929a31f0f6c819245e2921bfd01e7bd91201a9af39a2bdc"
+dependencies = [
+ "data-url",
+ "flate2",
+ "imagesize",
+ "kurbo",
+ "log",
+ "roxmltree",
+ "simplecss",
+ "siphasher 0.3.11",
+ "svgtypes",
+ "usvg-tree",
+]
+
+[[package]]
+name = "usvg-tree"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ee3d202ebdb97a6215604b8f5b4d6ef9024efd623cf2e373a6416ba976ec7d3"
+dependencies = [
+ "rctree",
+ "strict-num",
+ "svgtypes",
+ "tiny-skia-path",
+]
+
 [[package]]
 name = "utf16_iter"
 version = "1.0.5"
@@ -3009,6 +3482,7 @@ dependencies = [
  "document-features",
  "js-sys",
  "log",
+ "naga",
  "parking_lot",
  "profiling",
  "raw-window-handle",
@@ -3056,13 +3530,16 @@ dependencies = [
  "android_system_properties",
  "arrayvec",
  "ash",
+ "bit-set",
  "bitflags 2.9.0",
+ "block",
  "bytemuck",
  "cfg_aliases",
  "core-graphics-types",
  "glow",
  "glutin_wgl_sys",
  "gpu-alloc",
+ "gpu-allocator",
  "gpu-descriptor",
  "js-sys",
  "khronos-egl",
@@ -3077,6 +3554,7 @@ dependencies = [
  "ordered-float",
  "parking_lot",
  "profiling",
+ "range-alloc",
  "raw-window-handle",
  "renderdoc-sys",
  "rustc-hash",
@@ -3086,6 +3564,7 @@ dependencies = [
  "web-sys",
  "wgpu-types",
  "windows",
+ "windows-core",
 ]
 
 [[package]]
@@ -3525,6 +4004,12 @@ version = "0.8.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a62ce76d9b56901b19a74f19431b0d8b3bc7ca4ad685a746dfd78ca8f4fc6bda"
 
+[[package]]
+name = "xmlwriter"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec7a2a501ed189703dba8b08142f057e887dfc4b2cc4db2d343ac6376ba3e0b9"
+
 [[package]]
 name = "yoke"
 version = "0.7.5"

Cargo.toml

@@ -13,6 +13,7 @@ pinenote = []
 
 [dependencies]
 egui = "0.31"
+egui_extras = { version = "0.31", features = ["svg"] }
 eframe = { version = "0.31", default-features = false, features = [
     "glow",           # alt: "wgpu".
     "persistence",
@@ -40,9 +41,11 @@ web-sys = "0.3.77"
 [patch.crates-io]
 egui =         { git = "https://github.com/emilk/egui", rev = "f2ce6424f3a32f47308fb9871d540c01377b2cd9" }
 eframe =       { git = "https://github.com/emilk/egui", rev = "f2ce6424f3a32f47308fb9871d540c01377b2cd9" }
+egui_kittest = { git = "https://github.com/emilk/egui", rev = "f2ce6424f3a32f47308fb9871d540c01377b2cd9" }
 
 [dev-dependencies]
 insta = { version = "1.43.1", features = ["yaml"] }
+egui_kittest = { version = "0.31", features = ["wgpu", "snapshot"] }
 # egui = { path = "../egui/crates/egui" }
 # eframe = { path = "../egui/crates/eframe" }
 

assets/collapse-icon.svg

@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="256"
+   height="256"
+   viewBox="0 0 67.733332 67.733332"
+   version="1.1"
+   id="svg1"
+   inkscape:version="1.4.2 (ebf0e940, 2025-05-08)"
+   sodipodi:docname="collapse-icon.svg"
+   inkscape:export-filename="collapse-icon.png"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#505050"
+     bordercolor="#eeeeee"
+     borderopacity="1"
+     inkscape:showpageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#505050"
+     inkscape:document-units="mm"
+     inkscape:zoom="2.0010679"
+     inkscape:cx="97.198102"
+     inkscape:cy="140.42502"
+     inkscape:window-width="1472"
+     inkscape:window-height="815"
+     inkscape:window-x="0"
+     inkscape:window-y="38"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1" />
+  <defs
+     id="defs1" />
+  <g
+     inkscape:label="Lager 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <rect
+       style="fill:#000000;fill-opacity:0;stroke:#ffffff;stroke-width:4.92907;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       id="rect1"
+       width="62.804268"
+       height="52.220932"
+       x="2.4645352"
+       y="7.7562032"
+       ry="6.9627905" />
+    <path
+       style="fill:#000000;fill-opacity:0;stroke:#ffffff;stroke-width:4.92628;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       d="M 28.921473,6.35 V 61.383333"
+       id="path1" />
+    <path
+       style="fill:#000000;fill-opacity:0;stroke:#ffffff;stroke-width:3.12398;stroke-linecap:round;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       d="M 22.250504,15.411171 9.4994923,15.320325"
+       id="path1-7" />
+    <path
+       style="fill:#000000;fill-opacity:0;stroke:#ffffff;stroke-width:3.12398;stroke-linecap:round;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       d="M 22.250506,21.743139 9.4994938,21.652293"
+       id="path1-7-4" />
+    <path
+       style="fill:#000000;fill-opacity:0;stroke:#ffffff;stroke-width:3.12398;stroke-linecap:round;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       d="M 22.250506,28.075107 9.4994938,27.984261"
+       id="path1-7-5" />
+    <path
+       style="fill:#000000;fill-opacity:0;stroke:#ffffff;stroke-width:3.12398;stroke-linecap:round;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       d="M 22.250508,34.407075 9.4994958,34.316229"
+       id="path1-7-4-4" />
+  </g>
+</svg>

src/app.rs

@@ -6,10 +6,10 @@ use std::{
     time::{Duration, Instant},
 };
 
-use crate::{file_editor::FileEditor, preferences::Preferences, util::GuiSender};
+use crate::{file_editor::FileEditor, folder::Folder, preferences::Preferences, util::GuiSender};
 use egui::{
-    Align, Button, Color32, Context, FontData, FontDefinitions, Key, Modifiers, PointerButton,
+    Align, Button, Context, FontData, FontDefinitions, Image, Key, Modifiers, PointerButton,
-    RichText, ScrollArea, Stroke,
+    RichText, ScrollArea, Widget, include_image,
 };
 
 #[derive(serde::Deserialize, serde::Serialize)]
@@ -25,6 +25,10 @@ pub struct App {
     jobs: Jobs,
 
     tabs: Vec<(TabId, Tab)>,
+
+    show_folders: bool,
+    folders: Vec<Folder>,
+
     open_tab_index: Option<usize>,
 
     next_tab_id: TabId,
@@ -80,6 +84,7 @@ pub type TabId = usize;
 
 pub enum Action {
     OpenFile(FileEditor),
+    OpenFolder(Folder),
     MoveFile(TabId, PathBuf),
     CloseTab(TabId),
     // TODO
@@ -102,6 +107,8 @@ impl Default for App {
             tabs: vec![(1, Tab::File(FileEditor::new("note.md")))],
             open_tab_index: None,
             next_tab_id: 2,
+            show_folders: false,
+            folders: vec![],
         }
     }
 }
@@ -175,11 +182,8 @@ impl App {
 
         cc.egui_ctx.set_fonts(fonts);
 
-        cc.egui_ctx.style_mut(|style| {
+        // enable features on egui_extras to add more image types
-            // TODO: change color of text in TextEdit
+        egui_extras::install_image_loaders(&cc.egui_ctx);
-            style.visuals.widgets.noninteractive.fg_stroke =
-                Stroke::new(1.0, Color32::from_rgb(200, 200, 200));
-        });
 
         if let Some(storage) = cc.storage {
             return eframe::get_value(storage, eframe::APP_KEY).unwrap_or_default();
@@ -194,6 +198,18 @@ impl App {
 
     fn handle_action(&mut self, action: Action) {
         match action {
+            Action::OpenFolder(new_folder) => {
+                if let Some(folder) = self
+                    .folders
+                    .iter_mut()
+                    .find(|folder| folder.path() == new_folder.path())
+                {
+                    *folder = new_folder;
+                } else {
+                    self.folders.push(new_folder);
+                    self.folders.sort_by(|a, b| a.name().cmp(b.name()));
+                }
+            }
             Action::OpenFile(file_editor) => {
                 self.open_tab(Tab::File(file_editor));
             }
@@ -262,7 +278,12 @@ impl eframe::App for App {
                     }
 
                     if ui.button("Open Folder").clicked() {
-                        log::error!("Open Folder not implemented");
+                        self.jobs.start(ui.ctx(), move || {
+                            let path = rfd::FileDialog::new().pick_folder()?;
+                            let name = path.file_name()?.to_string_lossy().to_string();
+                            let folder = Folder::NotLoaded { name, path };
+                            Some(Action::OpenFolder(folder))
+                        });
                     }
 
                     if ui
@@ -277,8 +298,8 @@ impl eframe::App for App {
                     let can_save_file = self
                         .open_tab_index
                         .and_then(|i| self.tabs.get(i))
-                        .and_then(|(id, tab)| match tab {
+                        .map(|(id, tab)| match tab {
-                            Tab::File(file_editor) => Some((*id, file_editor)),
+                            Tab::File(file_editor) => (*id, file_editor),
                         })
                         .and_then(|(_, file_editor)| file_editor.path().zip(Some(file_editor)))
                         .is_some();
@@ -287,12 +308,11 @@ impl eframe::App for App {
                         self.save_active_tab(ui.ctx());
                     }
 
-                    let open_file =
+                    let open_file = self.open_tab_index.and_then(|i| self.tabs.get(i)).map(
-                        self.open_tab_index
+                        |(id, tab)| match tab {
-                            .and_then(|i| self.tabs.get(i))
+                            Tab::File(file_editor) => (*id, file_editor),
-                            .and_then(|(id, tab)| match tab {
+                        },
-                                Tab::File(file_editor) => Some((*id, file_editor)),
+                    );
-                            });
 
                     #[cfg(not(target_arch = "wasm32"))]
                     if ui
@@ -324,7 +344,16 @@ impl eframe::App for App {
                     }
                 });
 
+                ui.add_space(8.0);
+
+                let image = Image::new(include_image!("../assets/collapse-icon.svg"));
+                let image = image.tint(ui.style().visuals.text_color());
+                if Button::image(image).ui(ui).clicked() {
+                    self.show_folders = !self.show_folders;
+                }
+
                 if !self.jobs.handles.is_empty() {
+                    ui.add_space(8.0);
                     ui.spinner();
                 }
 
@@ -351,6 +380,39 @@ impl eframe::App for App {
             });
         });
 
+        egui::SidePanel::left("file browser")
+            .resizable(true)
+            .show_animated(ctx, self.show_folders, |ui| {
+                if ui.button("refresh").clicked() {
+                    for folder in &mut self.folders {
+                        folder.unload();
+                    }
+                }
+
+                ScrollArea::both().auto_shrink(false).show(ui, |ui| {
+                    self.folders.retain_mut(|folder| {
+                        let response = folder.show(ui);
+
+                        if let Some(file_path) = response.open_file {
+                            let file_path = file_path.to_owned();
+                            self.jobs.start(ui.ctx(), move || {
+                                let text = fs::read_to_string(&file_path)
+                                    .inspect_err(|e| {
+                                        log::error!("Failed to read {file_path:?}: {e}")
+                                    })
+                                    .ok()?;
+
+                                let editor = FileEditor::from_file(file_path, &text);
+                                Some(Action::OpenFile(editor))
+                            });
+                        }
+
+                        // delete on right-click
+                        !response.clicked_by(PointerButton::Secondary)
+                    });
+                });
+            });
+
         egui::CentralPanel::default().show(ctx, |ui| {
             if let Some(Tab::File(file_editor)) = self
                 .open_tab_index
@@ -382,14 +444,15 @@ impl App {
         let id = self.next_tab_id;
         self.next_tab_id += 1;
         self.tabs.insert(i, (id, tab));
+        self.open_tab_index = Some(i);
     }
 
     fn save_active_tab(&mut self, ctx: &Context) {
         let open_file = self
             .open_tab_index
             .and_then(|i| self.tabs.get_mut(i))
-            .and_then(|(id, tab)| match tab {
+            .map(|(id, tab)| match tab {
-                Tab::File(file_editor) => Some((*id, file_editor)),
+                Tab::File(file_editor) => (*id, file_editor),
             })
             .and_then(|(_, file_editor)| {
                 file_editor

src/easy_mark/easy_mark_highlighter.rs

@@ -1,243 +0,0 @@
-use egui::text::{CCursorRange, LayoutJob};
-
-use crate::easy_mark::easy_mark_parser;
-
-/// Highlight easymark, memoizing previous output to save CPU.
-///
-/// In practice, the highlighter is fast enough not to need any caching.
-#[derive(Default)]
-pub struct MemoizedHighlighter {
-    style: egui::Style,
-    code: String,
-    output: LayoutJob,
-}
-
-impl MemoizedHighlighter {
-    pub fn highlight(
-        &mut self,
-        egui_style: &egui::Style,
-        code: &str,
-        cursor: Option<CCursorRange>,
-    ) -> LayoutJob {
-        if (&self.style, self.code.as_str()) != (egui_style, code) {
-            self.style = egui_style.clone();
-            code.clone_into(&mut self.code);
-            self.output = highlight_easymark(egui_style, code, cursor);
-        }
-        self.output.clone()
-    }
-}
-
-pub fn highlight_easymark(
-    egui_style: &egui::Style,
-    mut text: &str,
-
-    // TODO: hide special characters where cursor isn't
-    _cursor: Option<CCursorRange>,
-) -> LayoutJob {
-    let mut job = LayoutJob::default();
-    let mut style = easy_mark_parser::Style::default();
-    let mut start_of_line = true;
-
-    const CODE_INDENT: f32 = 10.0;
-
-    while !text.is_empty() {
-        if start_of_line && text.starts_with("```") {
-            let astyle = format_from_style(
-                egui_style,
-                &easy_mark_parser::Style {
-                    code: true,
-                    ..Default::default()
-                },
-            );
-
-            // Render the initial backticks as spaces
-            text = &text[3..];
-            job.append("   ", CODE_INDENT, astyle.clone());
-
-            match text.find("\n```") {
-                Some(n) => {
-                    for line in text[..n + 1].lines() {
-                        job.append(line, CODE_INDENT, astyle.clone());
-                        job.append("\n", 0.0, astyle.clone());
-                    }
-                    // Render the final backticks as spaces
-                    job.append("   ", CODE_INDENT, astyle);
-                    text = &text[n + 4..];
-                }
-                None => {
-                    job.append(text, 0.0, astyle.clone());
-                    text = "";
-                }
-            };
-            style = Default::default();
-            continue;
-        }
-
-        if text.starts_with('`') {
-            style.code = true;
-            let end = text[1..]
-                .find(&['`', '\n'][..])
-                .map_or_else(|| text.len(), |i| i + 2);
-            job.append(&text[..end], 0.0, format_from_style(egui_style, &style));
-            text = &text[end..];
-            style.code = false;
-            continue;
-        }
-
-        let skip;
-
-        // zero-width space
-        let _zws = "\u{200b}";
-
-        let mut apply_basic_style =
-            |text: &mut &str,
-             style: &mut easy_mark_parser::Style,
-             access: fn(&mut easy_mark_parser::Style) -> &mut bool| {
-                let skip = if *access(style) {
-                    // Include the character that is ending this style:
-                    job.append(&text[..1], 0.0, format_from_style(egui_style, style));
-                    *text = &text[1..];
-                    0
-                } else {
-                    1
-                };
-                *access(style) ^= true;
-                skip
-            };
-
-        if text.starts_with('*') {
-            skip = apply_basic_style(&mut text, &mut style, |style| &mut style.strong);
-        } else if text.starts_with('/') {
-            skip = apply_basic_style(&mut text, &mut style, |style| &mut style.italics);
-        } else if text.starts_with('_') {
-            skip = apply_basic_style(&mut text, &mut style, |style| &mut style.underline);
-        } else if text.starts_with('$') {
-            skip = apply_basic_style(&mut text, &mut style, |style| &mut style.small);
-        } else if text.starts_with('~') {
-            skip = apply_basic_style(&mut text, &mut style, |style| &mut style.strikethrough);
-        } else if text.starts_with('^') {
-            skip = apply_basic_style(&mut text, &mut style, |style| &mut style.raised);
-        } else if text.starts_with('\\') && text.len() >= 2 {
-            skip = 2;
-        } else if start_of_line && text.starts_with(' ') {
-            // we don't preview indentation, because it is confusing
-            skip = 1;
-        } else if start_of_line && text.starts_with("###### ") {
-            style.heading = true;
-            skip = 7;
-        } else if start_of_line && text.starts_with("##### ") {
-            style.heading = true;
-            skip = 6;
-        } else if start_of_line && text.starts_with("#### ") {
-            style.heading = true;
-            skip = 5;
-        } else if start_of_line && text.starts_with("### ") {
-            style.heading = true;
-            skip = 4;
-        } else if start_of_line && text.starts_with("## ") {
-            style.heading = true;
-            skip = 3;
-        } else if start_of_line && text.starts_with("# ") {
-            style.heading = true;
-            skip = 2;
-        } else if start_of_line && text.starts_with("> ") {
-            style.quoted = true;
-            skip = 2;
-            // we don't preview indentation, because it is confusing
-        } else if start_of_line && text.trim_start().starts_with("- ") {
-            job.append("• ", 0.0, format_from_style(egui_style, &style));
-            text = &text[2..];
-            skip = 0;
-            // we don't preview indentation, because it is confusing
-        } else {
-            skip = 0;
-        }
-        // Note: we don't preview underline, strikethrough and italics because it confuses things.
-
-        // Swallow everything up to the next special character:
-        let line_end = text[skip..]
-            .find('\n')
-            .map_or_else(|| text.len(), |i| (skip + i + 1));
-        let end = text[skip..]
-            .find(&['*', '`', '~', '_', '/', '$', '^', '\\', '<', '['][..])
-            .map_or_else(|| text.len(), |i| (skip + i).max(1));
-
-        if line_end <= end {
-            job.append(
-                &text[..line_end],
-                0.0,
-                format_from_style(egui_style, &style),
-            );
-            text = &text[line_end..];
-            start_of_line = true;
-            style = Default::default();
-        } else {
-            job.append(&text[..end], 0.0, format_from_style(egui_style, &style));
-            text = &text[end..];
-            start_of_line = false;
-        }
-    }
-
-    job
-}
-
-fn format_from_style(
-    egui_style: &egui::Style,
-    emark_style: &easy_mark_parser::Style,
-) -> egui::text::TextFormat {
-    use egui::{Align, Color32, Stroke, TextStyle};
-
-    let color = if emark_style.strong || emark_style.heading {
-        egui_style.visuals.strong_text_color()
-    } else if emark_style.quoted {
-        egui_style.visuals.weak_text_color()
-    } else {
-        egui_style.visuals.text_color()
-    };
-
-    let text_style = if emark_style.heading {
-        TextStyle::Heading
-    } else if emark_style.code {
-        TextStyle::Monospace
-    } else if emark_style.small | emark_style.raised {
-        TextStyle::Small
-    } else {
-        TextStyle::Body
-    };
-
-    let background = if emark_style.code {
-        egui_style.visuals.code_bg_color
-    } else {
-        Color32::TRANSPARENT
-    };
-
-    let underline = if emark_style.underline {
-        Stroke::new(1.0, color)
-    } else {
-        Stroke::NONE
-    };
-
-    let strikethrough = if emark_style.strikethrough {
-        Stroke::new(1.0, color)
-    } else {
-        Stroke::NONE
-    };
-
-    let valign = if emark_style.raised {
-        Align::TOP
-    } else {
-        Align::BOTTOM
-    };
-
-    egui::text::TextFormat {
-        font_id: text_style.resolve(egui_style),
-        color,
-        background,
-        italics: emark_style.italics,
-        underline,
-        strikethrough,
-        valign,
-        ..Default::default()
-    }
-}

src/easy_mark/easy_mark_parser.rs

@@ -1,346 +0,0 @@
-//! A parser for `EasyMark`: a very simple markup language.
-//!
-//! WARNING: `EasyMark` is subject to change.
-//
-//! # `EasyMark` design goals:
-//! 1. easy to parse
-//! 2. easy to learn
-//! 3. similar to markdown
-
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub enum Item<'a> {
-    /// `\n`
-    // TODO(emilk): add Style here so empty heading still uses up the right amount of space.
-    Newline,
-
-    /// Text
-    Text(Style, &'a str),
-
-    /// title, url
-    Hyperlink(Style, &'a str, &'a str),
-
-    /// leading space before e.g. a [`Self::BulletPoint`].
-    Indentation(usize),
-
-    /// >
-    QuoteIndent,
-
-    /// - a point well made.
-    BulletPoint,
-
-    /// 1. numbered list. The string is the number(s).
-    NumberedPoint(&'a str),
-
-    /// ---
-    Separator,
-
-    /// language, code
-    CodeBlock(&'a str, &'a str),
-}
-
-#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
-pub struct Style {
-    /// # heading (large text)
-    pub heading: bool,
-
-    /// > quoted (slightly dimmer color or other font style)
-    pub quoted: bool,
-
-    /// `code` (monospace, some other color)
-    pub code: bool,
-
-    /// self.strong* (emphasized, e.g. bold)
-    pub strong: bool,
-
-    /// _underline_
-    pub underline: bool,
-
-    /// ~strikethrough~
-    pub strikethrough: bool,
-
-    /// /italics/
-    pub italics: bool,
-
-    /// $small$
-    pub small: bool,
-
-    /// ^raised^
-    pub raised: bool,
-}
-
-/// Parser for the `EasyMark` markup language.
-pub struct Parser<'a> {
-    /// The remainder of the input text
-    s: &'a str,
-
-    /// Are we at the start of a line?
-    start_of_line: bool,
-
-    /// Current self.style. Reset after a newline.
-    style: Style,
-}
-
-impl<'a> Parser<'a> {
-    pub fn new(s: &'a str) -> Self {
-        Self {
-            s,
-            start_of_line: true,
-            style: Style::default(),
-        }
-    }
-
-    /// `1. `, `42. ` etc.
-    fn numbered_list(&mut self) -> Option<Item<'a>> {
-        let n_digits = self.s.chars().take_while(|c| c.is_ascii_digit()).count();
-        if n_digits > 0 && self.s.chars().skip(n_digits).take(2).eq(". ".chars()) {
-            let number = &self.s[..n_digits];
-            self.s = &self.s[(n_digits + 2)..];
-            self.start_of_line = false;
-            return Some(Item::NumberedPoint(number));
-        }
-        None
-    }
-
-    // ```{language}\n{code}```
-    fn code_block(&mut self) -> Option<Item<'a>> {
-        if let Some(language_start) = self.s.strip_prefix("```") {
-            if let Some(newline) = language_start.find('\n') {
-                let language = &language_start[..newline];
-                let code_start = &language_start[newline + 1..];
-                if let Some(end) = code_start.find("\n```") {
-                    let code = &code_start[..end].trim();
-                    self.s = &code_start[end + 4..];
-                    self.start_of_line = false;
-                    return Some(Item::CodeBlock(language, code));
-                } else {
-                    self.s = "";
-                    return Some(Item::CodeBlock(language, code_start));
-                }
-            }
-        }
-        None
-    }
-
-    // `code`
-    fn inline_code(&mut self) -> Option<Item<'a>> {
-        if let Some(rest) = self.s.strip_prefix('`') {
-            self.s = rest;
-            self.start_of_line = false;
-            self.style.code = true;
-            let rest_of_line = &self.s[..self.s.find('\n').unwrap_or(self.s.len())];
-            if let Some(end) = rest_of_line.find('`') {
-                let item = Item::Text(self.style, &self.s[..end]);
-                self.s = &self.s[end + 1..];
-                self.style.code = false;
-                return Some(item);
-            } else {
-                let end = rest_of_line.len();
-                let item = Item::Text(self.style, rest_of_line);
-                self.s = &self.s[end..];
-                self.style.code = false;
-                return Some(item);
-            }
-        }
-        None
-    }
-
-    /// `<url>` or `[link](url)`
-    fn url(&mut self) -> Option<Item<'a>> {
-        if self.s.starts_with('<') {
-            let this_line = &self.s[..self.s.find('\n').unwrap_or(self.s.len())];
-            if let Some(url_end) = this_line.find('>') {
-                let url = &self.s[1..url_end];
-                self.s = &self.s[url_end + 1..];
-                self.start_of_line = false;
-                return Some(Item::Hyperlink(self.style, url, url));
-            }
-        }
-
-        // [text](url)
-        if self.s.starts_with('[') {
-            let this_line = &self.s[..self.s.find('\n').unwrap_or(self.s.len())];
-            if let Some(bracket_end) = this_line.find(']') {
-                let text = &this_line[1..bracket_end];
-                if this_line[bracket_end + 1..].starts_with('(') {
-                    if let Some(parens_end) = this_line[bracket_end + 2..].find(')') {
-                        let parens_end = bracket_end + 2 + parens_end;
-                        let url = &self.s[bracket_end + 2..parens_end];
-                        self.s = &self.s[parens_end + 1..];
-                        self.start_of_line = false;
-                        return Some(Item::Hyperlink(self.style, text, url));
-                    }
-                }
-            }
-        }
-        None
-    }
-}
-
-impl<'a> Iterator for Parser<'a> {
-    type Item = Item<'a>;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        loop {
-            if self.s.is_empty() {
-                return None;
-            }
-
-            // \n
-            if self.s.starts_with('\n') {
-                self.s = &self.s[1..];
-                self.start_of_line = true;
-                self.style = Style::default();
-                return Some(Item::Newline);
-            }
-
-            // Ignore line break (continue on the same line)
-            if self.s.starts_with("\\\n") && self.s.len() >= 2 {
-                self.s = &self.s[2..];
-                self.start_of_line = false;
-                continue;
-            }
-
-            // \ escape (to show e.g. a backtick)
-            if self.s.starts_with('\\') && self.s.len() >= 2 {
-                let text = &self.s[1..2];
-                self.s = &self.s[2..];
-                self.start_of_line = false;
-                return Some(Item::Text(self.style, text));
-            }
-
-            if self.start_of_line {
-                // leading space (indentation)
-                if self.s.starts_with(' ') {
-                    let length = self.s.find(|c| c != ' ').unwrap_or(self.s.len());
-                    self.s = &self.s[length..];
-                    self.start_of_line = true; // indentation doesn't count
-                    return Some(Item::Indentation(length));
-                }
-
-                // # Heading
-                if let Some(after) = self.s.strip_prefix("# ") {
-                    self.s = after;
-                    self.start_of_line = false;
-                    self.style.heading = true;
-                    continue;
-                }
-
-                // > quote
-                if let Some(after) = self.s.strip_prefix("> ") {
-                    self.s = after;
-                    self.start_of_line = true; // quote indentation doesn't count
-                    self.style.quoted = true;
-                    return Some(Item::QuoteIndent);
-                }
-
-                // - bullet point
-                if self.s.starts_with("- ") {
-                    self.s = &self.s[2..];
-                    self.start_of_line = false;
-                    return Some(Item::BulletPoint);
-                }
-
-                // `1. `, `42. ` etc.
-                if let Some(item) = self.numbered_list() {
-                    return Some(item);
-                }
-
-                // --- separator
-                if let Some(after) = self.s.strip_prefix("---") {
-                    self.s = after.trim_start_matches('-'); // remove extra dashes
-                    self.s = self.s.strip_prefix('\n').unwrap_or(self.s); // remove trailing newline
-                    self.start_of_line = false;
-                    return Some(Item::Separator);
-                }
-
-                // ```{language}\n{code}```
-                if let Some(item) = self.code_block() {
-                    return Some(item);
-                }
-            }
-
-            // `code`
-            if let Some(item) = self.inline_code() {
-                return Some(item);
-            }
-
-            if let Some(rest) = self.s.strip_prefix('*') {
-                self.s = rest;
-                self.start_of_line = false;
-                self.style.strong = !self.style.strong;
-                continue;
-            }
-            if let Some(rest) = self.s.strip_prefix('_') {
-                self.s = rest;
-                self.start_of_line = false;
-                self.style.underline = !self.style.underline;
-                continue;
-            }
-            if let Some(rest) = self.s.strip_prefix('~') {
-                self.s = rest;
-                self.start_of_line = false;
-                self.style.strikethrough = !self.style.strikethrough;
-                continue;
-            }
-            if let Some(rest) = self.s.strip_prefix('/') {
-                self.s = rest;
-                self.start_of_line = false;
-                self.style.italics = !self.style.italics;
-                continue;
-            }
-            if let Some(rest) = self.s.strip_prefix('$') {
-                self.s = rest;
-                self.start_of_line = false;
-                self.style.small = !self.style.small;
-                continue;
-            }
-            if let Some(rest) = self.s.strip_prefix('^') {
-                self.s = rest;
-                self.start_of_line = false;
-                self.style.raised = !self.style.raised;
-                continue;
-            }
-
-            // `<url>` or `[link](url)`
-            if let Some(item) = self.url() {
-                return Some(item);
-            }
-
-            // Swallow everything up to the next special character:
-            let end = self
-                .s
-                .find(&['*', '`', '~', '_', '/', '$', '^', '\\', '<', '[', '\n'][..])
-                .map_or_else(|| self.s.len(), |special| special.max(1));
-
-            let item = Item::Text(self.style, &self.s[..end]);
-            self.s = &self.s[end..];
-            self.start_of_line = false;
-            return Some(item);
-        }
-    }
-}
-
-#[test]
-fn test_easy_mark_parser() {
-    let items: Vec<_> = Parser::new("~strikethrough `code`~").collect();
-    assert_eq!(
-        items,
-        vec![
-            Item::Text(
-                Style {
-                    strikethrough: true,
-                    ..Default::default()
-                },
-                "strikethrough "
-            ),
-            Item::Text(
-                Style {
-                    code: true,
-                    strikethrough: true,
-                    ..Default::default()
-                },
-                "code"
-            ),
-        ]
-    );
-}

src/easy_mark/mod.rs

@@ -1,7 +0,0 @@
-//! Experimental markup language
-
-mod easy_mark_highlighter;
-pub mod easy_mark_parser;
-
-pub use easy_mark_highlighter::{MemoizedHighlighter, highlight_easymark};
-pub use easy_mark_parser as parser;

src/file_editor.rs

@@ -30,7 +30,7 @@ pub struct FileEditor {
 #[derive(serde::Deserialize, serde::Serialize)]
 pub enum BufferItem {
     Text(MdTextEdit),
-    Handwriting(Handwriting),
+    Handwriting(Box<Handwriting>),
 }
 
 impl FileEditor {
@@ -151,6 +151,7 @@ impl FileEditor {
                     BufferItem::Handwriting(handwriting) => {
                         let style = HandwritingStyle {
                             animate: preferences.animations,
+                            hide_cursor: preferences.hide_handwriting_cursor,
                             ..HandwritingStyle::from_theme(ui.ctx().theme())
                         };
                         if handwriting.ui(&style, ui).changed {
@@ -169,7 +170,7 @@ impl FileEditor {
                 dragger_rect.set_height(item_response.response.rect.height());
 
                 // Controls for moving the buffer item
-                ui.allocate_new_ui(
+                ui.scope_builder(
                     UiBuilder::new()
                         .max_rect(dragger_rect)
                         .layout(Layout::top_down(Align::Center)),
@@ -297,7 +298,7 @@ impl From<&str> for FileEditor {
                                     }
                                 }
                             };
-                            buffer.push(BufferItem::Handwriting(handwriting))
+                            buffer.push(BufferItem::Handwriting(Box::new(handwriting)))
                         }
                         Err(e) => {
                             log::error!("Failed to decode handwriting {content:?}: {e}");

src/folder.rs

@@ -0,0 +1,218 @@
+use std::{
+    fs::read_dir,
+    mem,
+    ops::Deref,
+    path::{Path, PathBuf},
+    sync::mpsc,
+    thread,
+};
+
+use egui::{Response, Ui};
+use eyre::{Context, OptionExt, eyre};
+use serde::{Deserialize, Serialize};
+
+pub enum Folder {
+    NotLoaded {
+        name: String,
+        path: PathBuf,
+    },
+    Loading {
+        name: String,
+        path: PathBuf,
+        recv: mpsc::Receiver<LoadedFolder>,
+    },
+    Loaded(LoadedFolder),
+}
+
+pub struct LoadedFolder {
+    pub name: String,
+    pub path: PathBuf,
+    pub child_folders: Vec<Folder>,
+    pub child_files: Vec<File>,
+}
+
+pub struct File {
+    pub name: String,
+    pub path: PathBuf,
+}
+
+pub struct FolderResponse<'a> {
+    inner: Response,
+    pub open_file: Option<&'a Path>,
+}
+
+impl Deref for FolderResponse<'_> {
+    type Target = Response;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
+impl LoadedFolder {
+    pub fn show<'a>(&'a mut self, ui: &mut Ui) -> FolderResponse<'a> {
+        let mut open_file = None;
+        let inner = ui
+            .collapsing(&self.name, |ui| {
+                for folder in &mut self.child_folders {
+                    open_file = open_file.or(folder.show(ui).open_file);
+                }
+
+                for file in &mut self.child_files {
+                    if ui.button(&file.name).clicked() {
+                        open_file = Some(file.path.as_path())
+                    };
+                }
+            })
+            .header_response;
+
+        FolderResponse { inner, open_file }
+    }
+
+    fn load(path: PathBuf) -> eyre::Result<Self> {
+        let name = path
+            .file_name()
+            .ok_or_eyre("Path is missing a file-name")?
+            .to_string_lossy()
+            .to_string();
+
+        let mut child_folders = vec![];
+        let mut child_files = vec![];
+
+        for entry in read_dir(&path).with_context(|| eyre!("Couldn't read dir {path:?}"))? {
+            let entry = entry.with_context(|| eyre!("Couldn't read dir {path:?}"))?;
+            let path = entry.path();
+            let name = path
+                .file_name()
+                .ok_or_eyre("Path is missing a file-name")?
+                .to_string_lossy()
+                .to_string();
+
+            let file_type = entry.file_type()?;
+
+            if file_type.is_symlink() {
+                log::error!("Symlinks not yet supported, skipping {path:?}");
+                continue;
+            } else if file_type.is_file() {
+                child_files.push(File { name, path });
+            } else if file_type.is_dir() {
+                child_folders.push(Folder::NotLoaded { name, path });
+            }
+        }
+
+        let folder = LoadedFolder {
+            name,
+            path,
+            child_folders,
+            child_files,
+        };
+
+        Ok(folder)
+    }
+}
+
+impl Folder {
+    fn load(&mut self, ui: &mut Ui) -> Option<&mut LoadedFolder> {
+        if let Folder::NotLoaded { name, path } = self {
+            let (tx, rx) = mpsc::channel();
+
+            {
+                let path = path.clone();
+                let ctx = ui.ctx().clone();
+                thread::spawn(move || match LoadedFolder::load(path) {
+                    Err(e) => log::error!("Failed to load folder: {e}"),
+                    Ok(folder) => {
+                        let _ = tx.send(folder);
+                        ctx.request_repaint();
+                    }
+                });
+            }
+
+            *self = Folder::Loading {
+                name: mem::take(name),
+                path: mem::take(path),
+                recv: rx,
+            };
+        }
+
+        if let Folder::Loading { recv, .. } = self {
+            match recv.try_recv() {
+                Ok(folder) => *self = Folder::Loaded(folder),
+                Err(_) => return None,
+            }
+        }
+
+        let Folder::Loaded(folder) = self else {
+            unreachable!()
+        };
+
+        Some(folder)
+    }
+
+    pub fn show<'a>(&'a mut self, ui: &mut Ui) -> FolderResponse<'a> {
+        self.load(ui);
+
+        if let Folder::Loaded(folder) = self {
+            return folder.show(ui);
+        }
+
+        FolderResponse {
+            inner: ui.label(self.name()),
+            open_file: None,
+        }
+    }
+
+    pub fn path(&self) -> &Path {
+        match self {
+            Folder::NotLoaded { path, .. } => path,
+            Folder::Loading { path, .. } => path,
+            Folder::Loaded(folder) => &folder.path,
+        }
+    }
+
+    pub fn name(&self) -> &str {
+        match self {
+            Folder::NotLoaded { name, .. } => name,
+            Folder::Loading { name, .. } => name,
+            Folder::Loaded(folder) => &folder.name,
+        }
+    }
+
+    pub fn unload(&mut self) {
+        let (name, path) = match self {
+            Folder::NotLoaded { .. } => return,
+            Folder::Loading { name, path, .. } => (name, path),
+            Folder::Loaded(folder) => (&mut folder.name, &mut folder.path),
+        };
+
+        *self = Folder::NotLoaded {
+            name: mem::take(name),
+            path: mem::take(path),
+        }
+    }
+}
+
+impl Serialize for Folder {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        self.path().serialize(serializer)
+    }
+}
+
+impl<'de> Deserialize<'de> for Folder {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        use serde::de::Error;
+        let path = PathBuf::deserialize(deserializer)?;
+        let name = path
+            .file_name()
+            .ok_or(D::Error::custom("Path is missing a file-name"))?
+            .to_string_lossy()
+            .to_string();
+        Ok(Folder::NotLoaded { name, path })
+    }
+}

src/handwriting/canvas_rasterizer.rs

@@ -0,0 +1,176 @@
+use std::sync::Arc;
+
+use egui::{
+    Color32, ColorImage, CornerRadius, Painter, Pos2, Rect, Stroke, StrokeKind, TextureHandle,
+    Vec2,
+    ahash::HashMap,
+    emath::TSTransform,
+    epaint::{Brush, RectShape, Vertex},
+    load::SizedTexture,
+};
+
+use crate::rasterizer::{PxBoundingBox, rasterize_triangle_onto, triangle_bounding_box};
+
+use super::StrokeBlendMode;
+
+const CHUNK_SIZE: usize = 64;
+
+/// Rasterize onto a resizeable canvas.
+#[derive(Default)]
+pub struct CanvasRasterizer {
+    image_size: [usize; 2],
+    tiles: HashMap<[usize; 2], Tile>,
+}
+
+struct Tile {
+    bounding_box: PxBoundingBox,
+    image: ColorImage,
+    texture: Option<TextureHandle>,
+    texture_is_dirty: bool,
+}
+
+impl Tile {
+    fn new(xi: usize, yi: usize) -> Self {
+        let x_from = xi * CHUNK_SIZE;
+        let y_from = yi * CHUNK_SIZE;
+        let bounding_box = PxBoundingBox {
+            x_from,
+            y_from,
+            x_to: x_from + CHUNK_SIZE,
+            y_to: y_from + CHUNK_SIZE,
+        };
+
+        Self {
+            bounding_box,
+            image: ColorImage::new([CHUNK_SIZE, CHUNK_SIZE], Color32::TRANSPARENT),
+            texture: None,
+            texture_is_dirty: false,
+        }
+    }
+}
+
+impl CanvasRasterizer {
+    pub fn set_size(&mut self, width: usize, height: usize) {
+        self.image_size = [width, height];
+        self.populate_tiles();
+    }
+
+    pub fn clear(&mut self) {
+        log::debug!("clearing all tiles");
+        self.tiles.clear();
+        self.populate_tiles();
+    }
+
+    fn populate_tiles(&mut self) {
+        let [width, height] = self.image_size;
+
+        // discard tiles that are out of bounds
+        self.tiles.retain(|_, tile| {
+            tile.bounding_box.x_from <= width && tile.bounding_box.y_from <= height
+        });
+
+        let chunk = |max: usize| {
+            (0..)
+                .step_by(CHUNK_SIZE)
+                .take_while(move |n| n <= &max)
+                .enumerate()
+        };
+
+        // create new tiles where we need them
+        for (xi, _x) in chunk(width) {
+            for (yi, _y) in chunk(height) {
+                self.tiles
+                    .entry([xi, yi])
+                    .or_insert_with(|| Tile::new(xi, yi));
+            }
+        }
+    }
+
+    pub fn rasterize<'a>(
+        &mut self,
+        point_to_pixel: TSTransform,
+        triangles: impl Iterator<Item = [&'a Vertex; 3]> + Clone,
+    ) {
+        for triangle in triangles {
+            let triangle_bounding_box = triangle_bounding_box(&triangle, point_to_pixel);
+            for chunk in chunks_from_bounding_box(triangle_bounding_box) {
+                let Some(tile) = self.tiles.get_mut(&chunk) else {
+                    continue;
+                };
+
+                let mut point_to_tile_pixel = point_to_pixel;
+                point_to_tile_pixel.translation -= Vec2::new(
+                    tile.bounding_box.x_from as f32,
+                    tile.bounding_box.y_from as f32,
+                );
+
+                tile.texture_is_dirty = true;
+                rasterize_triangle_onto::<StrokeBlendMode>(
+                    &mut tile.image,
+                    point_to_tile_pixel,
+                    triangle,
+                );
+            }
+        }
+    }
+
+    /// `at` defines the location in screen-coordinates where the canvas should be drawn.
+    pub fn show(&mut self, ctx: &egui::Context, painter: &Painter, at: Rect) {
+        let pixels_per_point = ctx.pixels_per_point();
+        let chunk_vec = Vec2::splat(CHUNK_SIZE as f32) / pixels_per_point;
+
+        for ([xi, yi], tile) in &mut self.tiles {
+            if tile.texture_is_dirty {
+                tile.texture_is_dirty = false;
+                if let Some(texture) = &mut tile.texture {
+                    texture.set(tile.image.clone(), Default::default());
+                } else {
+                    tile.texture = Some(ctx.load_texture(
+                        "handwriting",
+                        tile.image.clone(),
+                        Default::default(),
+                    ));
+                }
+            }
+
+            if let Some(texture) = &mut tile.texture {
+                let texture = SizedTexture::new(texture.id(), texture.size_vec2());
+                let shape = RectShape {
+                    rect: Rect::from_min_size(
+                        at.min + Vec2::new(*xi as f32, *yi as f32) * chunk_vec,
+                        chunk_vec,
+                    ),
+                    corner_radius: CornerRadius::ZERO,
+                    fill: Color32::WHITE,
+                    stroke: Stroke::NONE,
+                    stroke_kind: StrokeKind::Inside,
+                    round_to_pixels: None,
+                    blur_width: 0.0,
+                    brush: Some(Arc::new(Brush {
+                        fill_texture_id: texture.id,
+                        uv: Rect {
+                            min: Pos2::ZERO,
+                            max: Pos2::new(1.0, 1.0),
+                        },
+                    })),
+                };
+                painter.add(shape);
+            }
+        }
+    }
+}
+
+/// Get all chunk indices that overlaps with a PxBoundingBox.
+fn chunks_from_bounding_box(
+    triangle_bounding_box: PxBoundingBox,
+) -> impl Iterator<Item = [usize; 2]> {
+    let x_from_chunk = triangle_bounding_box.x_from / CHUNK_SIZE;
+    let y_from_chunk = triangle_bounding_box.y_from / CHUNK_SIZE;
+    let x_to_chunk = triangle_bounding_box.x_to.saturating_sub(1) / CHUNK_SIZE;
+    let y_to_chunk = triangle_bounding_box.y_to.saturating_sub(1) / CHUNK_SIZE;
+
+    let xs = x_from_chunk..=x_to_chunk;
+    let ys = y_from_chunk..=y_to_chunk;
+
+    ys.flat_map(move |yi| xs.clone().map(move |xi| [xi, yi]))
+}

src/handwriting/disk_format.rs

@@ -0,0 +1,97 @@
+//! see [Packet]
+
+use std::fmt::Display;
+
+use half::f16;
+use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout};
+
+/// A `u16` encoded in little-endian.
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, FromBytes, IntoBytes, KnownLayout, Immutable, PartialEq, Eq)]
+#[repr(C, packed)]
+pub struct u16_le([u8; 2]);
+
+/// An `f16` encoded in little-endian.
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, FromBytes, IntoBytes, KnownLayout, Immutable)]
+#[repr(C, packed)]
+pub struct f16_le(u16_le);
+
+/// Top-level type describing the handwriting disk-format.
+#[derive(FromBytes, KnownLayout, Immutable)]
+#[repr(C, packed)]
+pub struct DiskFormat {
+    pub header: Header,
+
+    /// A packed array of [Stroke]s.
+    pub strokes: [u8],
+}
+
+pub const V1: u16_le = u16_le::new(1);
+
+#[derive(FromBytes, IntoBytes, KnownLayout, Immutable)]
+#[repr(C, packed)]
+pub struct Header {
+    /// Version of the disk format
+    pub version: u16_le,
+}
+
+#[derive(FromBytes, IntoBytes, KnownLayout, Immutable)]
+#[repr(C, packed)]
+pub struct RawStrokeHeader {
+    /// Number of points in the stroke.
+    pub len: u16_le,
+}
+
+#[derive(FromBytes, KnownLayout, Immutable)]
+#[repr(C, packed)]
+pub struct RawStroke {
+    pub header: RawStrokeHeader,
+    pub positions: [f16_le],
+}
+
+impl RawStroke {
+    pub const MIN_LEN: usize = size_of::<RawStrokeHeader>();
+}
+
+impl u16_le {
+    pub const fn new(init: u16) -> Self {
+        u16_le(init.to_le_bytes())
+    }
+}
+
+impl f16_le {
+    pub const fn new(init: f16) -> Self {
+        f16_le(u16_le::new(init.to_bits()))
+    }
+}
+
+impl Display for u16_le {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        u16::from(*self).fmt(f)
+    }
+}
+
+impl From<u16_le> for u16 {
+    fn from(value: u16_le) -> Self {
+        u16::from_le_bytes(value.0)
+    }
+}
+
+impl From<f16_le> for f16 {
+    fn from(value: f16_le) -> Self {
+        f16::from_bits(u16::from(value.0))
+    }
+}
+
+impl From<u16> for u16_le {
+    fn from(value: u16) -> Self {
+        u16_le::new(value)
+    }
+}
+
+impl From<f16> for f16_le {
+    fn from(value: f16) -> Self {
+        f16_le::new(value)
+    }
+}

src/handwriting/mod.rs

@@ -1,3 +1,6 @@
+mod canvas_rasterizer;
+mod disk_format;
+
 use std::{
     fmt::{self, Display},
     iter, mem,
@@ -6,22 +9,20 @@ use std::{
 };
 
 use base64::{Engine, prelude::BASE64_STANDARD};
+use canvas_rasterizer::CanvasRasterizer;
+use disk_format::{DiskFormat, RawStroke, RawStrokeHeader, f16_le};
 use egui::{
-    Color32, ColorImage, CornerRadius, Event, Frame, Id, Mesh, PointerButton, Pos2, Rect, Sense,
+    Color32, Event, Frame, Id, Mesh, PointerButton, Pos2, Rect, Sense, Shape, Stroke, Theme, Ui,
-    Shape, Stroke, TextureHandle, Theme, Ui, Vec2,
+    Vec2,
     emath::{self, TSTransform},
-    epaint::{Brush, RectShape, TessellationOptions, Tessellator, Vertex},
+    epaint::{TessellationOptions, Tessellator, Vertex},
-    load::SizedTexture,
 };
 use eyre::{Context, bail};
 use eyre::{OptionExt, eyre};
 use half::f16;
-use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout};
+use zerocopy::{FromBytes, IntoBytes};
 
-use crate::{
+use crate::{custom_code_block::try_from_custom_code_block, rasterizer};
-    custom_code_block::try_from_custom_code_block,
-    rasterizer::{self, rasterize, rasterize_onto},
-};
 use crate::{custom_code_block::write_custom_code_block, util::random_id};
 
 const HANDWRITING_MIN_HEIGHT: f32 = 100.0;
@@ -33,7 +34,7 @@ pub const CODE_BLOCK_KEY: &str = "handwriting";
 
 type StrokeBlendMode = rasterizer::blend::Normal;
 
-const TESSELATION_OPTIONS: TessellationOptions = TessellationOptions {
+const TESSELLATION_OPTIONS: TessellationOptions = TessellationOptions {
     feathering: true,
     feathering_size_in_pixels: 1.0,
     coarse_tessellation_culling: true,
@@ -55,42 +56,41 @@ pub struct HandwritingStyle {
     pub bg_line_stroke: Stroke,
     pub bg_color: Color32,
     pub animate: bool,
+    pub hide_cursor: bool,
 }
 
 #[derive(serde::Deserialize, serde::Serialize)]
 #[serde(default)]
 pub struct Handwriting {
-    #[serde(skip, default = "random_id")]
-    id: Id,
-
     strokes: Vec<Vec<Pos2>>,
 
-    /// The stroke that is currently being drawed.
-    #[serde(skip)]
-    current_stroke: Vec<Pos2>,
-
-    /// The lines that have not been blitted to `texture` yet.
-    #[serde(skip)]
-    unblitted_lines: Vec<[Pos2; 2]>,
-
     height: f32,
     desired_height: f32,
 
-    /// Tesselated mesh of all strokes
     #[serde(skip)]
+    e: Ephemeral,
+}
+
+/// Handwriting data that isn't persisted across restarts.
+struct Ephemeral {
+    id: Id,
+
+    canvas_rasterizer: CanvasRasterizer,
+
+    /// The stroke that is currently being drawed.
+    current_stroke: Vec<Pos2>,
+
+    /// The lines that have not been blitted to `texture` yet.
+    unblitted_lines: Vec<[Pos2; 2]>,
+
+    tessellator: Option<Tessellator>,
+
+    /// Tessellated mesh of all strokes
     mesh: Arc<Mesh>,
 
-    #[serde(skip)]
-    texture: Option<TextureHandle>,
-
-    #[serde(skip)]
-    image: ColorImage,
-
-    #[serde(skip)]
     refresh_texture: bool,
 
     /// Context of the last mesh render.
-    #[serde(skip)]
     last_mesh_ctx: Option<MeshContext>,
 }
 
@@ -106,56 +106,28 @@ struct MeshContext {
 
     pub pixels_per_point: f32,
 
-    /// Canvas size in points
-    pub size: Vec2,
-
     pub stroke: Stroke,
 }
 
-/// Get [Painting::texture], initializing it if necessary.
-macro_rules! texture {
-    ($self_:expr, $ui:expr, $mesh_context:expr) => {{
-        let ui: &Ui = $ui;
-        let mesh_context: &MeshContext = $mesh_context;
-        let image_size = mesh_context.pixel_size();
-
-        let new_image = || {
-            let image = ColorImage::new(image_size, Color32::TRANSPARENT);
-            ui.ctx()
-                .load_texture("handwriting", image, Default::default())
-        };
-
-        let texture = $self_.texture.get_or_insert_with(new_image);
-
-        if texture.size() != image_size {
-            $self_.refresh_texture = true;
-            // TODO: don't redraw the entire mesh, just blit the old texture onto the new one
-            *texture = new_image()
-        };
-
-        texture
-    }};
-}
-
-impl MeshContext {
-    /// Calculate canvas size in pixels
-    pub fn pixel_size(&self) -> [usize; 2] {
-        let Vec2 { x, y } = self.size * self.pixels_per_point;
-        [x, y].map(|f| f.ceil() as usize)
-    }
-}
-
 impl Default for Handwriting {
     fn default() -> Self {
         Self {
-            id: random_id(),
             strokes: Default::default(),
-            current_stroke: Default::default(),
             height: HANDWRITING_MIN_HEIGHT,
             desired_height: HANDWRITING_MIN_HEIGHT,
+            e: Default::default(),
+        }
+    }
+}
+
+impl Default for Ephemeral {
+    fn default() -> Self {
+        Self {
+            id: random_id(),
+            canvas_rasterizer: Default::default(),
+            current_stroke: Default::default(),
+            tessellator: None,
             mesh: Default::default(),
-            texture: None,
-            image: ColorImage::new([0, 0], Color32::WHITE),
             refresh_texture: true,
             last_mesh_ctx: None,
             unblitted_lines: Default::default(),
@@ -177,32 +149,26 @@ impl Handwriting {
                 ui.separator();
             }
 
-            if ui.button("Clear Painting").clicked() {
+            if ui.button("clear").clicked() {
                 self.strokes.clear();
-                self.refresh_texture = true;
+                self.e.refresh_texture = true;
                 response.changed = true;
             }
 
             ui.add_enabled_ui(!self.strokes.is_empty(), |ui| {
-                if ui.button("Undo").clicked() {
+                if ui.button("undo").clicked() {
                     self.strokes.pop();
-                    self.refresh_texture = true;
+                    self.e.refresh_texture = true;
                     response.changed = true;
                 }
             });
 
-            let vertex_count: usize = self.mesh.indices.len() / 3;
+            let vertex_count: usize = self.e.mesh.indices.len() / 3;
             ui.label(format!("vertices: {vertex_count}"));
         })
         .response
     }
 
-    fn commit_current_line(&mut self, response: &mut HandwritingResponse) {
-        debug_assert!(!self.current_stroke.is_empty());
-        self.strokes.push(mem::take(&mut self.current_stroke));
-        response.changed = true;
-    }
-
     pub fn ui_content(
         &mut self,
         style: &HandwritingStyle,
@@ -211,7 +177,7 @@ impl Handwriting {
     ) -> egui::Response {
         if style.animate {
             self.height = ui.ctx().animate_value_with_time(
-                self.id.with("height animation"),
+                self.e.id.with("height animation"),
                 self.desired_height,
                 0.4,
             );
@@ -220,12 +186,11 @@ impl Handwriting {
         }
 
         let desired_size = Vec2::new(ui.available_width(), self.height);
-        let (response, painter) = ui.allocate_painter(desired_size, Sense::drag());
+        let (mut response, painter) = ui.allocate_painter(desired_size, Sense::drag());
 
-        let mut response = response
+        if style.hide_cursor {
-            //.on_hover_cursor(CursorIcon::Crosshair)
+            response = response.on_hover_and_drag_cursor(egui::CursorIcon::None);
-            //.on_hover_and_drag_cursor(CursorIcon::None)
+        }
-            ;
 
         let size = response.rect.size();
 
@@ -238,7 +203,7 @@ impl Handwriting {
         let from_screen = to_screen.inverse();
 
         // Was the user in the process of drawing a stroke last frame?
-        let was_drawing = !self.current_stroke.is_empty();
+        let was_drawing = !self.e.current_stroke.is_empty();
 
         // Is the user in the process of drawing a stroke now?
         let is_drawing = response.interact_pointer_pos().is_some();
@@ -286,17 +251,17 @@ impl Handwriting {
                         _ => Some(next),
                     }
                 })
-                .cloned()
                 .filter(|event| {
                     // FIXME: pinenote: PointerMoved are duplicated after the MouseMoved events
                     cfg!(not(feature = "pinenote")) || !matches!(event, Event::PointerMoved(..))
                 })
+                .cloned()
                 .collect::<Vec<_>>()
             });
 
             // Process input events and turn them into strokes
             for event in events {
-                let last_canvas_pos = self.current_stroke.last();
+                let last_canvas_pos = self.e.current_stroke.last();
 
                 match event {
                     Event::PointerMoved(new_position) => {
@@ -338,7 +303,7 @@ impl Handwriting {
                     } => match (button, pressed) {
                         (PointerButton::Primary, true) => {
                             if last_canvas_pos.is_none() {
-                                self.current_stroke.push(from_screen * pos);
+                                self.e.current_stroke.push(from_screen * pos);
                             }
                         }
                         (PointerButton::Primary, false) => {
@@ -360,7 +325,7 @@ impl Handwriting {
                     // TODO: In theory, we can get multiple press->draw->release series
                     // in the same frame. Should handle this.
                     Event::PointerGone | Event::WindowFocused(false) => {
-                        if !self.current_stroke.is_empty() {
+                        if !self.e.current_stroke.is_empty() {
                             self.commit_current_line(hw_response);
                             break;
                         }
@@ -394,7 +359,7 @@ impl Handwriting {
                 painter.add(shape);
             });
 
-        // Get the dimensions of the image
+        // Get the position and dimensions of the image
         let mesh_rect = response
             .rect
             .with_max_y(response.rect.min.y + self.desired_height);
@@ -403,100 +368,102 @@ impl Handwriting {
         let new_context = MeshContext {
             ui_theme: ui.ctx().theme(),
             pixels_per_point: ui.pixels_per_point(),
-            size: mesh_rect.size(),
             stroke: style.stroke,
         };
 
         // Figure out if we need to re-rasterize the mesh.
-        if Some(&new_context) != self.last_mesh_ctx.as_ref() {
+        if Some(&new_context) != self.e.last_mesh_ctx.as_ref() {
-            self.refresh_texture = true;
+            self.e.refresh_texture = true;
         }
 
-        if self.refresh_texture {
+        let [px_width, px_height] = {
+            let Vec2 { x, y } = mesh_rect.size() * new_context.pixels_per_point;
+            [x, y].map(|f| f.ceil() as usize)
+        };
+
+        self.e.canvas_rasterizer.set_size(px_width, px_height);
+
+        if self.e.refresh_texture {
             // ...if we do, rasterize the entire texture from scratch
-            self.refresh_texture(style, new_context, ui);
+            self.refresh_texture(style, new_context);
-            self.unblitted_lines.clear();
+            self.e.unblitted_lines.clear();
-        } else if !self.unblitted_lines.is_empty() {
+        } else if !self.e.unblitted_lines.is_empty() {
             // ...if we don't, we can get away with  only rasterizing the *new* lines onto the
             // existing texture.
-            for [from, to] in std::mem::take(&mut self.unblitted_lines) {
+            for [from, to] in std::mem::take(&mut self.e.unblitted_lines) {
-                self.draw_line_to_texture(from, to, &new_context, ui);
+                self.draw_line_to_texture(from, to, &new_context);
             }
-            self.unblitted_lines.clear();
+            self.e.unblitted_lines.clear();
         }
 
         // Draw the texture
-        if let Some(texture) = &self.texture {
+        self.e.canvas_rasterizer.show(ui.ctx(), &painter, mesh_rect);
-            let texture = SizedTexture::new(texture.id(), texture.size_vec2());
-            let shape = RectShape {
-                rect: mesh_rect,
-                corner_radius: CornerRadius::ZERO,
-                fill: Color32::WHITE,
-                stroke: Stroke::NONE,
-                stroke_kind: egui::StrokeKind::Inside,
-                round_to_pixels: None,
-                blur_width: 0.0,
-                brush: Some(Arc::new(Brush {
-                    fill_texture_id: texture.id,
-                    uv: Rect {
-                        min: Pos2::ZERO,
-                        max: Pos2::new(1.0, 1.0),
-                    },
-                })),
-            };
-            painter.add(shape);
-        }
 
         response
     }
 
-    fn refresh_texture(
+    fn commit_current_line(&mut self, response: &mut HandwritingResponse) {
-        &mut self,
+        debug_assert!(!self.e.current_stroke.is_empty());
-        style: &HandwritingStyle,
+        self.strokes.push(mem::take(&mut self.e.current_stroke));
-        mesh_context: MeshContext,
+        response.changed = true;
-        ui: &mut Ui,
+    }
-    ) {
-        self.last_mesh_ctx = Some(mesh_context);
 
-        self.refresh_texture = false;
+    /// Tessellate and rasterize the strokes into a new texture.
+    fn refresh_texture(&mut self, style: &HandwritingStyle, mesh_context: MeshContext) {
+        let Ephemeral {
+            current_stroke,
+            tessellator,
+            mesh,
+            refresh_texture,
+            last_mesh_ctx,
+            ..
+        } = &mut self.e;
+        // TODO: don't tessellate and rasterize on the GUI thread
+
+        *last_mesh_ctx = Some(mesh_context);
+
+        *refresh_texture = false;
 
         #[cfg(not(target_arch = "wasm32"))]
         let start_time = std::time::Instant::now();
 
-        let mut tesselator = Tessellator::new(
+        let mesh = Arc::make_mut(mesh);
-            mesh_context.pixels_per_point,
-            TESSELATION_OPTIONS,
-            Default::default(), // we don't tesselate fonts
-            vec![],
-        );
-
-        let mesh = Arc::make_mut(&mut self.mesh);
         mesh.clear();
 
+        // TODO: re-use tessellator if pixels_per_point hasn't changed
+        let tessellator = tessellator.insert(new_tessellator(mesh_context.pixels_per_point));
+
         self.strokes
             .iter()
-            .chain([&self.current_stroke])
+            .chain([&*current_stroke])
             .filter(|stroke| stroke.len() >= 2)
             .map(|stroke| {
                 //let points: Vec<Pos2> = stroke.iter().map(|&p| to_screen * p).collect();
                 egui::Shape::line(stroke.clone(), style.stroke)
             })
             .for_each(|shape| {
-                tesselator.tessellate_shape(shape, mesh);
+                tessellator.tessellate_shape(shape, mesh);
             });
 
-        let texture = texture!(self, ui, &mesh_context);
+        // sanity-check that tessellation did not produce any NaNs.
-        let triangles = mesh_triangles(&self.mesh);
+        // this can happen if the line contains duplicated consecutive positions
+        //for vertex in &mesh.vertices {
+        //    debug_assert!(vertex.pos.x.is_finite(), "{} must be finite", vertex.pos.x);
+        //    debug_assert!(vertex.pos.y.is_finite(), "{} must be finite", vertex.pos.y);
+        //}
 
-        let [px_x, px_y] = mesh_context.pixel_size();
         let point_to_pixel = TSTransform::from_scaling(mesh_context.pixels_per_point);
-        self.image = rasterize::<StrokeBlendMode>(px_x, px_y, point_to_pixel, triangles);
+        let triangles = mesh_triangles(&self.e.mesh);
-        texture.set(self.image.clone(), Default::default());
+
+        self.e.canvas_rasterizer.clear();
+        self.e
+            .canvas_rasterizer
+            .rasterize(point_to_pixel, triangles);
 
         #[cfg(not(target_arch = "wasm32"))]
         {
             let elapsed = start_time.elapsed();
-            println!("refreshed mesh in {:.3}s", elapsed.as_secs_f32());
+            log::debug!("refreshed mesh in {:.3}s", elapsed.as_secs_f32());
         }
     }
 
@@ -519,46 +486,46 @@ impl Handwriting {
         response
     }
 
+    /// Append a new [Pos2] to [Self::current_stroke].
+    ///
+    /// Queue a new line to be drawn onto [Self::texture].
     fn push_to_stroke(&mut self, new_canvas_pos: Pos2) {
-        if let Some(&last_canvas_pos) = self.current_stroke.last() {
+        if let Some(&last_canvas_pos) = self.e.current_stroke.last() {
             if last_canvas_pos == new_canvas_pos {
                 return;
             }
 
-            self.unblitted_lines.push([last_canvas_pos, new_canvas_pos]);
+            self.e
+                .unblitted_lines
+                .push([last_canvas_pos, new_canvas_pos]);
         }
 
-        self.current_stroke.push(new_canvas_pos);
+        self.e.current_stroke.push(new_canvas_pos);
     }
 
     /// Draw a single line onto the existing texture.
-    fn draw_line_to_texture(
+    fn draw_line_to_texture(&mut self, from: Pos2, to: Pos2, mesh_context: &MeshContext) {
-        &mut self,
+        // INVARIANT: if this function was called, then pixels_per_point is the same as last frame,
-        from: Pos2,
+        // so there's no need to create a new tessellator.
-        to: Pos2,
+        let tessellator = self
-        mesh_context: &MeshContext,
+            .e
-        ui: &mut Ui,
+            .tessellator
-    ) {
+            .get_or_insert_with(|| new_tessellator(mesh_context.pixels_per_point));
-        let mut tesselator = Tessellator::new(
-            mesh_context.pixels_per_point,
-            TESSELATION_OPTIONS,
-            Default::default(), // we don't tesselate fonts
-            vec![],
-        );
 
         let mut mesh = Mesh::default();
         let line = egui::Shape::line_segment([from, to], mesh_context.stroke);
-        tesselator.tessellate_shape(line, &mut mesh);
+        tessellator.tessellate_shape(line, &mut mesh);
 
-        self.draw_mesh_to_texture(&mesh, mesh_context, ui);
+        self.draw_mesh_to_texture(&mesh, mesh_context);
     }
 
     /// Draw a single mesh onto the existing texture.
-    fn draw_mesh_to_texture(&mut self, mesh: &Mesh, mesh_context: &MeshContext, ui: &mut Ui) {
+    fn draw_mesh_to_texture(&mut self, mesh: &Mesh, mesh_context: &MeshContext) {
         let triangles = mesh_triangles(mesh);
         let point_to_pixel = TSTransform::from_scaling(mesh_context.pixels_per_point);
-        rasterize_onto::<StrokeBlendMode>(&mut self.image, point_to_pixel, triangles);
+        self.e
-        texture!(self, ui, mesh_context).set(self.image.clone(), Default::default());
+            .canvas_rasterizer
+            .rasterize(point_to_pixel, triangles);
     }
 
     pub fn strokes(&self) -> &[Vec<Pos2>] {
@@ -586,24 +553,49 @@ impl Handwriting {
             ..Default::default()
         }
     }
+
+    pub fn encode_as_disk_format(&self) -> Box<[u8]> {
+        let mut bytes = vec![];
+        let header = disk_format::Header {
+            version: disk_format::V1,
+        };
+
+        bytes.extend_from_slice(header.as_bytes());
+
+        for stroke in &self.strokes {
+            let Ok(len) = u16::try_from(stroke.len()) else {
+                log::error!("More than u16::MAX points in a stroke!");
+                continue;
+            };
+
+            let header = RawStrokeHeader { len: len.into() };
+            bytes.extend_from_slice(header.as_bytes());
+
+            for position in stroke {
+                for v in [position.x, position.y] {
+                    let v = f16::from_f32(v);
+                    let v = f16_le::from(v);
+                    bytes.extend_from_slice(v.as_bytes());
+                }
+            }
+        }
+
+        bytes.into_boxed_slice()
+    }
+}
+
+fn new_tessellator(pixels_per_point: f32) -> Tessellator {
+    Tessellator::new(
+        pixels_per_point,
+        TESSELLATION_OPTIONS,
+        Default::default(), // we don't tessellate fonts
+        vec![],
+    )
 }
 
 impl Display for Handwriting {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let mut raw = vec![];
+        let raw = self.encode_as_disk_format();
-
-        for stroke in &self.strokes {
-            raw.push((stroke.len() as u16).to_le_bytes());
-            for position in stroke {
-                let x = half::f16::from_f32(position.x);
-                let y = half::f16::from_f32(position.y);
-                raw.push(x.to_bits().to_le_bytes());
-                raw.push(y.to_bits().to_le_bytes());
-            }
-        }
-
-        let raw = raw.as_slice().as_bytes();
-
         write_custom_code_block(f, CODE_BLOCK_KEY, BASE64_STANDARD.encode(raw))
     }
 }
@@ -619,53 +611,72 @@ impl FromStr for Handwriting {
             .decode(s)
             .wrap_err("Failed to decode painting data from base64")?;
 
-        #[allow(non_camel_case_types)]
+        // HACK: first iteration of disk format did not have version header
-        type u16_le = [u8; 2];
+        //let mut bytes = bytes;
+        //bytes.insert(0, 0);
+        //bytes.insert(0, 1);
 
-        #[allow(non_camel_case_types)]
+        let disk_format = DiskFormat::ref_from_bytes(&bytes[..]).map_err(|_| eyre!("Too short"))?;
-        type f16_le = [u8; 2];
 
-        #[derive(FromBytes, KnownLayout, Immutable)]
+        if disk_format.header.version != disk_format::V1 {
-        #[repr(C, packed)]
+            bail!(
-        struct Stroke {
+                "Unknown disk_format version: {}",
-            pub len: u16_le,
+                disk_format.header.version
-            pub positions: [f16_le],
+            );
         }
 
-        let mut bytes = &bytes[..];
+        let mut raw_strokes = &disk_format.strokes[..];
         let mut strokes = vec![];
 
-        while !bytes.is_empty() {
+        while !raw_strokes.is_empty() {
-            let header_len = size_of::<u16_le>();
+            if raw_strokes.len() < RawStroke::MIN_LEN {
-            if bytes.len() < header_len {
+                bail!("Invalid remaining length: {}", raw_strokes.len());
-                bail!("Invalid remaining length: {}", bytes.len());
             }
 
-            let stroke = Stroke::ref_from_bytes(&bytes[..header_len]).expect("length is correct");
+            let stroke = RawStroke::ref_from_bytes(&raw_strokes[..RawStroke::MIN_LEN])
-            let len = usize::from(u16::from_le_bytes(stroke.len));
+                .expect("length is correct");
-            let len = len * size_of::<f16_le>() * 2;
 
-            if bytes.len() < len {
+            // get length as number of points
-                bail!("Invalid remaining length: {}", bytes.len());
+            let len = usize::from(u16::from(stroke.header.len));
+
+            // convert to length in bytes
+            let byte_len = 2 * size_of::<f16_le>() * len;
+
+            if raw_strokes.len() < byte_len {
+                bail!("Invalid remaining length: {}", raw_strokes.len());
             }
 
-            let (stroke, rest) = bytes.split_at(header_len + len);
+            let (stroke, rest) = raw_strokes.split_at(RawStroke::MIN_LEN + byte_len);
-            bytes = rest;
+            raw_strokes = rest;
-            let stroke = Stroke::ref_from_bytes(stroke)
-                .map_err(|e| eyre!("Failed to decode stroke bytes: {e}"))?;
 
-            let mut positions = stroke
+            let stroke = RawStroke::ref_from_bytes(stroke).expect("length is correct");
+
+            debug_assert_eq!(
+                stroke.positions.len().rem_euclid(2),
+                0,
+                "{} must be divisible by 2",
+                stroke.positions.len()
+            );
+            debug_assert_eq!(stroke.positions.len(), len * 2);
+
+            let mut last_pos = Pos2::new(f32::NEG_INFINITY, f32::INFINITY);
+
+            // positions are encoded as an array of f16s [x, y, x, y, x, y, ..]
+            let stroke: Vec<Pos2> = stroke
                 .positions
-                .iter()
+                .chunks_exact(2)
-                .map(|&position| f16::from_bits(u16::from_le_bytes(position)));
+                .map(|chunk| [chunk[0], chunk[1]])
+                .map(|pos| pos.map(f16::from)) // interpret bytes as f16
+                .map(|pos| pos.map(f32::from)) // widen to f32
+                .filter(|pos| pos.iter().all(|f| f.is_finite())) // filter out NaNs and Infs
+                .map(|[x, y]| Pos2::new(x, y))
+                .filter(|pos| {
+                    let is_duplicate = pos == &last_pos;
+                    last_pos = *pos;
+                    !is_duplicate // skip duplicates
+                })
+                .collect();
 
-            let mut stroke = vec![];
-            while let Some(x) = positions.next() {
-                let Some(y) = positions.next() else {
-                    unreachable!("len is a multiple of two");
-                };
-                stroke.push(Pos2::new(x.into(), y.into()));
-            }
             strokes.push(stroke);
         }
 
@@ -696,16 +707,19 @@ impl HandwritingStyle {
         }
 
         HandwritingStyle {
-            stroke: Stroke::new(1.6, stroke_color),
+            stroke: Stroke::new(1.0, stroke_color),
             bg_color,
             bg_line_stroke: Stroke::new(0.5, line_color),
             animate: true,
+            hide_cursor: false,
         }
     }
 }
 
-fn mesh_triangles(mesh: &Mesh) -> impl Iterator<Item = [&Vertex; 3]> {
+fn mesh_triangles(mesh: &Mesh) -> impl Iterator<Item = [&Vertex; 3]> + Clone {
-    mesh.triangles()
+    mesh.indices
+        .chunks_exact(3)
+        .map(|chunk| [chunk[0], chunk[1], chunk[2]])
         .map(|indices| indices.map(|i| &mesh.vertices[i as usize]))
 }
 

src/handwriting/snapshots/inkr__handwriting__test__deserialized handwriting.snap

@@ -0,0 +1,19 @@
+---
+source: src/handwriting/mod.rs
+expression: deserialized.strokes
+---
+[
+    [
+        [-1.0 1.0],
+        [3.0 1.0],
+        [3.0 3.0],
+        [1.5 2.0],
+        [0.0 0.0],
+    ],
+    [
+        [3.0 3.0],
+        [-1.0 1.0],
+        [0.0 0.0],
+        [3.0 1.0],
+    ],
+]

src/handwriting/snapshots/inkr__handwriting__test__handwriting example.snap

@@ -0,0 +1,19 @@
+---
+source: src/handwriting/mod.rs
+expression: handwriting.strokes
+---
+[
+    [
+        [-1.0 1.0],
+        [3.0 1.0],
+        [3.0 3.0],
+        [1.5 2.0],
+        [0.0 0.0],
+    ],
+    [
+        [3.0 3.0],
+        [-1.0 1.0],
+        [0.0 0.0],
+        [3.0 1.0],
+    ],
+]

src/handwriting/snapshots/inkr__handwriting__test__serialized handwriting.snap

@@ -0,0 +1,7 @@
+---
+source: src/handwriting/mod.rs
+expression: serialized
+---
+```handwriting
+AQAFAAC8ADwAQgA8AEIAQgA+AEAAAAAABAAAQgBCALwAPAAAAAAAQgA8
+```

src/lib.rs

@@ -3,9 +3,10 @@
 pub mod app;
 pub mod constants;
 pub mod custom_code_block;
-pub mod easy_mark;
 pub mod file_editor;
+pub mod folder;
 pub mod handwriting;
+pub mod markdown;
 pub mod preferences;
 pub mod rasterizer;
 pub mod text_editor;

src/markdown/ast.rs

@@ -0,0 +1,54 @@
+use super::span::Span;
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum Heading {
+    H1,
+    H2,
+    H3,
+    H4,
+    H5,
+    H6,
+}
+
+#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
+pub struct Style {
+    /// # heading (large text)
+    pub heading: Option<Heading>,
+
+    /// > quoted (slightly dimmer color or other font style)
+    pub quoted: bool,
+
+    /// `code` (monospace, some other color)
+    pub code: bool,
+
+    /// self.strong* (emphasized, e.g. bold)
+    pub strong: bool,
+
+    /// _underline_
+    pub underline: bool,
+
+    /// ~strikethrough~
+    pub strikethrough: bool,
+
+    /// /italics/
+    pub italics: bool,
+
+    /// $small$
+    pub small: bool,
+
+    /// ^raised^
+    pub raised: bool,
+}
+
+pub enum Item<'a> {
+    Text {
+        span: Span<'a>,
+        style: Style,
+    },
+
+    CodeBlock {
+        all: Span<'a>,
+        language: Span<'a>,
+        code: Span<'a>,
+    },
+}

src/markdown/grammar.lalrpop

@@ -0,0 +1,10 @@
+use std::str::FromStr;
+
+grammar;
+
+pub Term: i32 = {
+    <n:Num> => n,
+    "(" <t:Term> ")" => t,
+};
+
+Num: i32 = <s:r"[0-9]+"> => i32::from_str(s).unwrap();

src/markdown/highlighter.rs

@@ -0,0 +1,118 @@
+use egui::text::{CCursorRange, LayoutJob};
+
+use super::{Item, Style, parse};
+
+/// Highlight markdown, caching previous output to save CPU.
+#[derive(Default)]
+pub struct MemoizedHighlighter {
+    style: egui::Style,
+    code: String,
+    output: LayoutJob,
+}
+
+impl MemoizedHighlighter {
+    pub fn highlight(
+        &mut self,
+        egui_style: &egui::Style,
+        code: &str,
+        cursor: Option<CCursorRange>,
+    ) -> LayoutJob {
+        if (&self.style, self.code.as_str()) != (egui_style, code) {
+            self.style = egui_style.clone();
+            code.clone_into(&mut self.code);
+            self.output = highlight_markdown(egui_style, code, cursor);
+        }
+        self.output.clone()
+    }
+}
+
+pub fn highlight_markdown(
+    egui_style: &egui::Style,
+    text: &str,
+
+    // TODO: hide special characters where cursor isn't
+    _cursor: Option<CCursorRange>,
+) -> LayoutJob {
+    let mut job = LayoutJob::default();
+
+    let code_style = Style {
+        code: true,
+        ..Default::default()
+    };
+
+    for item in parse(text) {
+        match item {
+            Item::Text { span, style } => {
+                job.append(&span, 0.0, format_from_style(egui_style, &style));
+            }
+            Item::CodeBlock {
+                all,
+                language: _, // TODO
+                code: _,     // TODO
+            } => {
+                job.append(&all, 100.0, format_from_style(egui_style, &code_style));
+            }
+        }
+    }
+
+    job
+}
+
+fn format_from_style(egui_style: &egui::Style, style: &Style) -> egui::text::TextFormat {
+    use egui::{Align, Color32, Stroke, TextStyle};
+
+    let color = if style.code {
+        egui_style.visuals.strong_text_color() * Color32::GREEN
+    } else if style.strong || style.heading.is_some() {
+        egui_style.visuals.strong_text_color()
+    } else if style.quoted {
+        egui_style.visuals.weak_text_color()
+    } else {
+        egui_style.visuals.text_color()
+    };
+
+    let text_style = if style.heading.is_some() {
+        TextStyle::Heading
+    } else if style.code {
+        TextStyle::Monospace
+    } else if style.small | style.raised {
+        TextStyle::Small
+    } else {
+        TextStyle::Body
+    };
+
+    let background = if style.code {
+        egui_style.visuals.code_bg_color
+    } else {
+        Color32::TRANSPARENT
+    };
+
+    let underline = if style.underline {
+        Stroke::new(1.0, color)
+    } else {
+        Stroke::NONE
+    };
+
+    let strikethrough = if style.strikethrough {
+        Stroke::new(1.0, color)
+    } else {
+        Stroke::NONE
+    };
+
+    let valign = if style.raised {
+        Align::TOP
+    } else {
+        Align::BOTTOM
+    };
+
+    egui::text::TextFormat {
+        font_id: text_style.resolve(egui_style),
+        color,
+        background,
+        italics: style.italics,
+        underline,
+        strikethrough,
+        valign,
+        ..Default::default()
+    }
+}

src/markdown/mod.rs

@@ -0,0 +1,11 @@
+mod ast;
+mod highlighter;
+mod parser;
+mod span;
+mod tokenizer;
+
+pub use ast::*;
+pub use highlighter::*;
+pub use parser::*;
+pub use span::*;
+pub use tokenizer::*;

src/markdown/parser.rs

@@ -0,0 +1,172 @@
+use std::iter::{self, once};
+
+use crate::markdown::Style;
+
+use super::{Item, Span, Token, TokenKind, tokenize};
+
+pub fn parse(text: &str) -> Vec<Item<'_>> {
+    let tokens: Vec<_> = tokenize(text).collect();
+    parse_tokens(&tokens)
+}
+
+pub fn parse_tokens<'a>(mut tokens: &[Token<'a>]) -> Vec<Item<'a>> {
+    // pretend that the first token was preceeded by a newline.
+    // means we don't have to handle the first token as a special case.
+    let mut prev = TokenKind::Newline;
+
+    let mut style = Style::default();
+
+    let mono_style = Style {
+        code: true,
+        ..Default::default()
+    };
+
+    iter::from_fn(move || {
+        if tokens.is_empty() {
+            return None;
+        }
+
+        let token = tokens.first().unwrap();
+        tokens = &tokens[1..];
+
+        let start_of_line = prev == TokenKind::Newline;
+        prev = token.kind;
+
+        let mut basic_style: Option<fn(&mut Style) -> &mut bool> = None;
+
+        match token.kind {
+            TokenKind::CodeBlock if start_of_line => {
+                let language = collect_until(
+                    None,
+                    &mut tokens,
+                    any_of([TokenKind::Newline]),
+                );
+
+                let code = collect_until(
+                    None,
+                    &mut tokens,
+                    series([TokenKind::Newline, TokenKind::CodeBlock]),
+                );
+
+                let all = [
+                    &token.span,
+                    &language,
+                    &code,
+                ].into_iter().fold(Span::empty(), |a, b| a.try_merge(b).unwrap());
+
+                let language = language.trim_end_matches("\n");
+                let code = code.trim_end_matches("\n```");
+
+                return Some(Item::CodeBlock { all, language, code });
+            }
+
+            TokenKind::Newline => style = Style::default(),
+
+            TokenKind::Strong => basic_style = Some(|s| &mut s.strong),
+            TokenKind::Italic => basic_style = Some(|s| &mut s.italics),
+            TokenKind::Strikethrough => basic_style = Some(|s| &mut s.strikethrough),
+
+            TokenKind::CodeBlock | TokenKind::Mono => {
+                let span = collect_until(
+                    Some(token),
+                    &mut tokens,
+                    any_of([TokenKind::Mono, TokenKind::CodeBlock, TokenKind::Newline]),
+                );
+
+                return Some(Item::Text { span, style: mono_style});
+            }
+
+            // TODO: different heading strengths
+            TokenKind::Heading(h) if start_of_line => style.heading = Some(h),
+            TokenKind::Quote if start_of_line => style.quoted = true,
+
+            // TODO: replace dashes with dots
+            //// TODO: indented list entries
+            //TokenKind::ListEntry if start_of_line => {
+            //    job.append("• ", 0.0, format_from_style(egui_style, &style));
+            //    continue;
+            //}
+
+            TokenKind::Text
+            // the following tokens are only richly rendered if encountered e.g. at start_of_line.
+            | TokenKind::Indentation
+            | TokenKind::ListEntry
+            | TokenKind::Heading(..)
+            | TokenKind::Quote => {}
+        }
+
+        // if we encountered a marker for Bold, Italic, or Strikethrough, toggle that style and
+        // render the token with the style enabled.
+        if let Some(basic_style) = basic_style {
+            let mut tmp_style = style;
+            *basic_style(&mut tmp_style) = true;
+            *basic_style(&mut style) ^= true; // toggle
+            return Some(Item::Text {
+                span: token.span.clone(),
+                style: tmp_style,
+            });
+        }
+
+        Some(Item::Text {
+            span: token.span.clone(),
+            style,
+        })
+    })
+    .collect()
+}
+
+fn series<'a, const N: usize>(of: [TokenKind; N]) -> impl FnMut(&[Token<'a>; N]) -> bool {
+    move |token| {
+        of.iter()
+            .zip(token)
+            .all(|(kind, token)| kind == &token.kind)
+    }
+}
+
+fn any_of<'a, const N: usize>(these: [TokenKind; N]) -> impl FnMut(&[Token<'a>; 1]) -> bool {
+    move |[token]| these.contains(&token.kind)
+}
+
+/// Collect all tokens up to and including `pattern`, and merge them into a signle span.
+///
+/// `N` determines how many specific and consecutive tokens we are looking for.
+/// i.e. if we were looking for a [TokenKind::Newline] followed by a [TokenKind::Quote], `N`
+/// would equal `2`.
+///
+/// `pattern` is a function that accepts an array of `N` tokens and returns `true` if they match,
+/// i.e. if we should stop collecting. [any_of] and [series] can help to construct this function.
+///
+/// The collected tokens will be split off the head of the slice referred to by `tokens`.
+///
+/// # Panic
+/// Panics if `tokens` does not contain only consecutive adjacent spans.
+fn collect_until<'a, const N: usize>(
+    first_token: Option<&Token<'a>>,
+    tokens: &mut &[Token<'a>],
+    pattern: impl FnMut(&[Token<'a>; N]) -> bool,
+) -> Span<'a>
+where
+    // &[T; N]: TryFrom<&[T]>
+    for<'b> &'b [Token<'a>; N]: TryFrom<&'b [Token<'a>]>,
+{
+    let mut windows = tokens.windows(N).map(|slice| {
+        <&[Token<'a>; N]>::try_from(slice)
+            .ok()
+            .expect("`windows` promises to return slices of length N")
+    });
+
+    let split_at = match windows.position(pattern) {
+        Some(i) => i + N,
+        None => tokens.len(), // consume everything
+    };
+
+    let (consume, keep) = tokens.split_at(split_at);
+    *tokens = keep;
+
+    once(first_token)
+        .flatten()
+        .chain(consume)
+        .fold(Span::empty(), |span: Span<'_>, token| {
+            span.try_merge(&token.span).unwrap()
+        })
+}

src/markdown/snapshots/inkr__markdown__tokenizer__tests__tokenize.snap

@@ -0,0 +1,46 @@
+---
+source: src/markdown/tokenizer.rs
+expression: examples
+---
+- string: "just some normal text :D"
+  tokens:
+    - "Token { span: Span(0..24, \"just some normal text :D\"), kind: Text }"
+- string: normal *bold* normal
+  tokens:
+    - "Token { span: Span(0..7, \"normal \"), kind: Text }"
+    - "Token { span: Span(7..8, \"*\"), kind: Strong }"
+    - "Token { span: Span(8..12, \"bold\"), kind: Text }"
+    - "Token { span: Span(12..13, \"*\"), kind: Strong }"
+    - "Token { span: Span(13..20, \" normal\"), kind: Text }"
+- string: normal * maybe bold? * normal
+  tokens:
+    - "Token { span: Span(0..7, \"normal \"), kind: Text }"
+    - "Token { span: Span(7..8, \"*\"), kind: Strong }"
+    - "Token { span: Span(8..21, \" maybe bold? \"), kind: Text }"
+    - "Token { span: Span(21..22, \"*\"), kind: Strong }"
+    - "Token { span: Span(22..29, \" normal\"), kind: Text }"
+- string: "```lang\ncode code code\n```"
+  tokens:
+    - "Token { span: Span(0..3, \"```\"), kind: CodeBlock }"
+    - "Token { span: Span(3..7, \"lang\"), kind: Text }"
+    - "Token { span: Span(7..8, \"\\n\"), kind: Newline }"
+    - "Token { span: Span(8..22, \"code code code\"), kind: Text }"
+    - "Token { span: Span(22..23, \"\\n\"), kind: Newline }"
+    - "Token { span: Span(23..26, \"```\"), kind: CodeBlock }"
+- string: "*_``_*"
+  tokens:
+    - "Token { span: Span(0..1, \"*\"), kind: Strong }"
+    - "Token { span: Span(1..2, \"_\"), kind: Italic }"
+    - "Token { span: Span(2..3, \"`\"), kind: Mono }"
+    - "Token { span: Span(3..4, \"`\"), kind: Mono }"
+    - "Token { span: Span(4..5, \"_\"), kind: Italic }"
+    - "Token { span: Span(5..6, \"*\"), kind: Strong }"
+- string: "*_`*_*_"
+  tokens:
+    - "Token { span: Span(0..1, \"*\"), kind: Strong }"
+    - "Token { span: Span(1..2, \"_\"), kind: Italic }"
+    - "Token { span: Span(2..3, \"`\"), kind: Mono }"
+    - "Token { span: Span(3..4, \"*\"), kind: Strong }"
+    - "Token { span: Span(4..5, \"_\"), kind: Italic }"
+    - "Token { span: Span(5..6, \"*\"), kind: Strong }"
+    - "Token { span: Span(6..7, \"_\"), kind: Italic }"

src/markdown/span.rs

@@ -0,0 +1,115 @@
+use std::{
+    fmt,
+    ops::{Deref, Range},
+};
+
+use eyre::{bail, eyre};
+
+#[derive(Clone, Eq, PartialEq)]
+pub struct Span<'a> {
+    complete_str: &'a str,
+    range: Range<usize>,
+}
+
+impl<'a> Span<'a> {
+    pub fn new(complete_str: &'a str) -> Self {
+        Self {
+            complete_str,
+            range: 0..complete_str.len(),
+        }
+    }
+
+    pub const fn empty() -> Self {
+        Span {
+            complete_str: "",
+            range: 0..0,
+        }
+    }
+
+    pub fn get(&self, slice: Range<usize>) -> Option<Self> {
+        let start = self.range.start.checked_add(slice.start)?;
+        let end = self.range.start.checked_add(slice.end)?;
+
+        if end > self.range.end || end < start {
+            return None;
+        }
+
+        Some(Self {
+            complete_str: self.complete_str,
+            range: Range { start, end },
+        })
+    }
+
+    pub fn complete_str(&self) -> Self {
+        Self::new(self.complete_str)
+    }
+
+    pub fn split_at(&self, i: usize) -> Option<(Self, Self)> {
+        let head = self.get(0..i)?;
+        let tail = self.get(i..self.range.len())?;
+        Some((head, tail))
+    }
+
+    pub fn trim_end_matches(&self, p: &str) -> Self {
+        if !self.ends_with(p) {
+            return self.clone();
+        }
+
+        Self {
+            range: self.range.start..self.range.end - p.len(),
+            complete_str: self.complete_str,
+        }
+    }
+
+    /// Try to merge the spans.
+    ///
+    /// If either spans is empty, this just returns the other one.
+    /// This only works if spans are pointing into the same backing buffer, and are adjacent.
+    pub fn try_merge(&self, other: &Self) -> eyre::Result<Self> {
+        if self.is_empty() {
+            return Ok(other.clone());
+        }
+
+        if other.is_empty() {
+            return Ok(self.clone());
+        }
+
+        if self.complete_str.as_ptr() != other.complete_str.as_ptr() {
+            bail!("Can't merge different strings");
+        }
+
+        if self.range.end == other.range.start {
+            Ok(Self {
+                range: self.range.start..other.range.end,
+                ..*self
+            })
+        } else if self.range.start == other.range.end {
+            Ok(Self {
+                range: other.range.start..self.range.end,
+                ..*self
+            })
+        } else {
+            Err(eyre!("String: {:?}", self.complete_str)
+                .wrap_err(eyre!("Span 2: {:?}", other.deref()))
+                .wrap_err(eyre!("Span 1: {:?}", self.deref()))
+                .wrap_err("Can't merge disjoint string spans"))
+        }
+    }
+}
+
+impl Deref for Span<'_> {
+    type Target = str;
+
+    fn deref(&self) -> &Self::Target {
+        &self.complete_str[self.range.clone()]
+    }
+}
+
+impl<'a> fmt::Debug for Span<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_tuple("Span")
+            .field(&self.range)
+            .field(&self.deref())
+            .finish()
+    }
+}

src/markdown/tokenizer.rs

@@ -0,0 +1,146 @@
+use std::iter;
+
+use super::{Heading, span::Span};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum TokenKind {
+    /// A newline that isn't a codeblock
+    Newline,
+
+    /// "#" to "######"
+    Heading(Heading),
+
+    /// A newline followed by three `
+    CodeBlock,
+
+    Mono,
+    Strong,
+    Italic,
+    Strikethrough,
+
+    /// ">"
+    Quote,
+
+    /// Two spaces
+    Indentation,
+
+    /// "- "
+    ListEntry,
+
+    /// Normal text
+    Text,
+}
+
+const TOKENS: &[(&'static str, TokenKind)] = &[
+    ("\n", TokenKind::Newline),
+    ("######", TokenKind::Heading(Heading::H6)),
+    ("#####", TokenKind::Heading(Heading::H5)),
+    ("####", TokenKind::Heading(Heading::H4)),
+    ("###", TokenKind::Heading(Heading::H3)),
+    ("##", TokenKind::Heading(Heading::H2)),
+    ("#", TokenKind::Heading(Heading::H1)),
+    ("```", TokenKind::CodeBlock),
+    ("`", TokenKind::Mono),
+    ("*", TokenKind::Strong),
+    ("_", TokenKind::Italic),
+    ("~", TokenKind::Strikethrough),
+    (">", TokenKind::Quote),
+    ("  ", TokenKind::Indentation),
+    ("- ", TokenKind::ListEntry),
+];
+
+#[derive(Debug)]
+pub struct Token<'a> {
+    pub span: Span<'a>,
+    pub kind: TokenKind,
+}
+
+pub fn tokenize<'a>(s: &'a str) -> impl Iterator<Item = Token<'a>> {
+    let mut s = Span::new(s);
+    let mut yield_n: usize = 0;
+
+    iter::from_fn(move || {
+        loop {
+            if s.is_empty() {
+                return None;
+            }
+
+            if yield_n == s.len() {
+                let (token, rest) = s.split_at(s.len()).unwrap();
+                let token = Token {
+                    span: token,
+                    kind: TokenKind::Text,
+                };
+                s = rest;
+                return Some(token);
+            }
+
+            let token = TOKENS.iter().find_map(|(token_str, token_kind)| {
+                s[yield_n..]
+                    .starts_with(token_str)
+                    .then(|| (*token_kind, token_str.len()))
+            });
+
+            let Some((kind, len)) = token else {
+                yield_n += s[yield_n..].chars().next().unwrap_or('\0').len_utf8();
+                continue;
+            };
+
+            if yield_n > 0 {
+                let (token, rest) = s.split_at(yield_n).unwrap();
+                let token = Token {
+                    span: token,
+                    kind: TokenKind::Text,
+                };
+                s = rest;
+                yield_n = 0;
+                return Some(token);
+            }
+
+            let (token, rest) = s.split_at(len).unwrap();
+            let token = Token { span: token, kind };
+            s = rest;
+            return Some(token);
+        }
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use serde::Serialize;
+
+    use super::tokenize;
+
+    #[test]
+    fn test_tokenize() {
+        let examples = [
+            "just some normal text :D",
+            "normal *bold* normal",
+            "normal * maybe bold? * normal",
+            "```lang\ncode code code\n```",
+            "*_``_*",
+            "*_`*_*_",
+        ];
+
+        #[derive(Serialize)]
+        struct Result {
+            pub string: &'static str,
+
+            /// Debug-printed tokens
+            pub tokens: Vec<String>,
+        }
+
+        let examples = examples
+            .into_iter()
+            .map(|string| {
+                let tokens = tokenize(string)
+                    .map(|tokens| format!("{tokens:?}"))
+                    .collect::<Vec<_>>();
+
+                Result { string, tokens }
+            })
+            .collect::<Vec<_>>();
+
+        insta::assert_yaml_snapshot!(examples);
+    }
+}

src/preferences.rs

@@ -10,6 +10,9 @@ pub struct Preferences {
     /// Enable high-contrast theme
     pub high_contrast: bool,
 
+    /// Hide the cursor when handwriting
+    pub hide_handwriting_cursor: bool,
+
     #[serde(skip)]
     has_applied_theme: bool,
 }
@@ -20,6 +23,7 @@ impl Default for Preferences {
             animations: true,
             high_contrast: false,
             has_applied_theme: false,
+            hide_handwriting_cursor: false,
         }
     }
 }
@@ -30,13 +34,18 @@ impl Preferences {
         if !self.has_applied_theme {
             self.has_applied_theme = true;
 
+            let mut dark_visuals = Visuals::dark();
+            let mut light_visuals = Visuals::light();
+
+            dark_visuals.code_bg_color = Color32::BLACK;
+            dark_visuals.code_bg_color = Color32::BLACK;
+            light_visuals.code_bg_color = Color32::WHITE;
+
             if self.high_contrast {
                 // widgets.active:         color of headers in textedit
                 // widgets.inactive:       color of button labels
                 // widgets.hovered:        color of hovered button labels
                 // widgets.noninteractive: color of labels and normal textedit text
-                let mut dark_visuals = Visuals::dark();
-                let mut light_visuals = Visuals::light();
 
                 dark_visuals.widgets.noninteractive.fg_stroke.color = Color32::WHITE;
                 dark_visuals.widgets.inactive.fg_stroke.color = Color32::WHITE;
@@ -45,13 +54,16 @@ impl Preferences {
                 light_visuals.widgets.noninteractive.fg_stroke.color = Color32::BLACK;
                 light_visuals.widgets.inactive.fg_stroke.color = Color32::BLACK;
                 light_visuals.widgets.hovered.fg_stroke.color = Color32::BLACK;
+            } else {
+                dark_visuals.widgets.noninteractive.fg_stroke.color =
+                    Color32::from_rgb(0xaa, 0xaa, 0xaa);
+
+                light_visuals.widgets.noninteractive.fg_stroke.color =
+                    Color32::from_rgb(0x11, 0x11, 0x11);
+            }
 
             ctx.set_visuals_of(Theme::Dark, dark_visuals);
             ctx.set_visuals_of(Theme::Light, light_visuals);
-            } else {
-                ctx.set_visuals_of(Theme::Dark, Visuals::dark());
-                ctx.set_visuals_of(Theme::Light, Visuals::light());
-            }
         }
     }
 
@@ -67,6 +79,8 @@ impl Preferences {
             self.apply(ui.ctx());
         }
 
+        ui.toggle_value(&mut self.hide_handwriting_cursor, "Hide Handwriting Cursor");
+
         egui::widgets::global_theme_preference_buttons(ui);
     }
 }

src/rasterizer.rs

@@ -1,5 +1,6 @@
 use core::f32;
 use egui::{Color32, ColorImage, Pos2, Rect, Vec2, emath::TSTransform, epaint::Vertex};
+use std::ops::Range;
 
 pub trait BlendFn {
     fn blend(a: Color32, b: Color32) -> Color32;
@@ -72,15 +73,11 @@ pub fn rasterize_onto<'a, Blend: BlendFn>(
 
             // If the pixel is within the triangle, fill it in.
             if point_in_triangle.inside {
-                let c0 = triangle[0]
+                let [c0, c1, c2] = [0, 1, 2].map(|i| {
+                    triangle[i]
                         .color
-                    .linear_multiply(point_in_triangle.weights[0]);
+                        .linear_multiply(point_in_triangle.weights[i])
-                let c1 = triangle[1]
+                });
-                    .color
-                    .linear_multiply(point_in_triangle.weights[1]);
-                let c2 = triangle[2]
-                    .color
-                    .linear_multiply(point_in_triangle.weights[2]);
 
                 let color = c0 + c1 + c2;
 
@@ -90,9 +87,20 @@ pub fn rasterize_onto<'a, Blend: BlendFn>(
     }
 }
 
+/// Rasterize a single triangles onto an image,
+///
+/// Triangle positions must be in image-local point-coords.
+pub fn rasterize_triangle_onto<'a, Blend: BlendFn>(
+    image: &mut ColorImage,
+    point_to_pixel: TSTransform,
+    triangle: [&'a Vertex; 3],
+) {
+    rasterize_onto::<Blend>(image, point_to_pixel, [triangle].into_iter());
+}
+
 /// A bounding box, measured in pixels.
 #[derive(Debug, PartialEq, Eq)]
-struct PxBoundingBox {
+pub struct PxBoundingBox {
     pub x_from: usize,
     pub y_from: usize,
     pub x_to: usize,
@@ -108,9 +116,42 @@ impl PxBoundingBox {
             y_to: self.y_to.min(other.y_to),
         }
     }
+
+    pub fn union(&self, other: &PxBoundingBox) -> PxBoundingBox {
+        PxBoundingBox {
+            x_from: self.x_from.min(other.x_from),
+            y_from: self.y_from.min(other.y_from),
+            x_to: self.x_to.max(other.x_to),
+            y_to: self.y_to.max(other.y_to),
+        }
     }
 
-fn triangle_bounding_box(triangle: &[&Vertex; 3], point_to_pixel: TSTransform) -> PxBoundingBox {
+    pub fn x_range(&self) -> Range<usize> {
+        self.x_from..self.x_to
+    }
+
+    pub fn y_range(&self) -> Range<usize> {
+        self.y_from..self.y_to
+    }
+
+    /// Test whether two boxes do NOT overlap
+    pub fn overlaps_with(&self, other: &PxBoundingBox) -> bool {
+        !self.is_disjoint_from(other)
+    }
+
+    pub fn is_disjoint_from(&self, other: &PxBoundingBox) -> bool {
+        false
+            || self.x_from > other.x_to
+            || self.y_from > other.y_to
+            || other.x_from > self.x_to
+            || other.y_from > self.y_to
+    }
+}
+
+pub fn triangle_bounding_box(
+    triangle: &[&Vertex; 3],
+    point_to_pixel: TSTransform,
+) -> PxBoundingBox {
     // calculate bounding box in point coords
     let mut rect = Rect::NOTHING;
     for vertex in triangle {
@@ -169,6 +210,10 @@ fn point_in_triangle(point: Pos2, triangle: [&Vertex; 3]) -> PointInTriangle {
     // Normalize the weights.
     let weights = areas.map(|area| area / triangle_area);
 
+    if cfg!(debug_assertions) && weights.into_iter().any(f32::is_nan) {
+        panic!("weights must not be NaN! {weights:?} {triangle_area:?} {areas:?} {sides:?}");
+    }
+
     PointInTriangle { inside, weights }
 }
 

src/snapshots/inkr__custom_code_block__test__iter_markdown-2.snap

@@ -0,0 +1,43 @@
+---
+source: src/custom_code_block.rs
+expression: list
+---
+[
+    Line(
+        "\n",
+    ),
+    Line(
+        "# Hello world\n",
+    ),
+    Line(
+        "## Subheader\n",
+    ),
+    Line(
+        "- 1\n",
+    ),
+    CodeBlock {
+        key: "foo",
+        content: "  whatever\n     some code\n Hi mom!",
+        span: "```foo\n  whatever\n     some code\n Hi mom!\n```",
+    },
+    Line(
+        " \n",
+    ),
+    Line(
+        "\n",
+    ),
+    CodeBlock {
+        key: "` # wrong number of ticks, but that's ok",
+        content: " ``` # indented ticks",
+        span: "```` # wrong number of ticks, but that's ok\n ``` # indented ticks\n```\n",
+    },
+    Line(
+        "\n",
+    ),
+    Line(
+        "``` # no closing ticks\n",
+    ),
+    Line(
+        "            ",
+    ),
+]

src/snapshots/inkr__painting__test__serialized handwriting.snap

@@ -0,0 +1,7 @@
+---
+source: src/painting.rs
+expression: serialized
+---
+```handwriting
+BQAAvAA8AEIAPABCAEIAPgBAAAAAAAQAAEIAQgC8ADwAAAAAAEIAPA==
+```

src/text_editor.rs

@@ -8,7 +8,7 @@ use egui::{
     Color32, InputState, Key, Modifiers, TextBuffer, TextEdit, Ui, Vec2, text::CCursorRange,
 };
 
-use crate::easy_mark::MemoizedHighlighter;
+use crate::markdown::MemoizedHighlighter;
 
 #[derive(Default, serde::Deserialize, serde::Serialize)]
 pub struct MdTextEdit {
@@ -50,8 +50,8 @@ impl MdTextEdit {
 
         let w = ui.available_width();
 
-        let mut layouter = |ui: &egui::Ui, easymark: &dyn TextBuffer, _wrap_width: f32| {
+        let mut layouter = |ui: &egui::Ui, markdown: &dyn TextBuffer, _wrap_width: f32| {
-            let mut layout_job = highlighter.highlight(ui.style(), easymark.as_str(), *cursor);
+            let mut layout_job = highlighter.highlight(ui.style(), markdown.as_str(), *cursor);
             layout_job.wrap.max_width = w - 10.0;
             ui.fonts(|f| f.layout_job(layout_job))
         };